These are rough guesses only:

$345 Dart Intake manifold
$360 Stainless one piece intake/exhaust valves
$325 Hydraulic roller cam
$375 Hydraulic roller lifters
$300 Roller rocker arms
$140 Valve srpings
$25 Valve Seals
$650 HP800cfm Holley carb

Total cost for only ONE engine/PARTS ONLY: $2520
Add the other engine and it comes to: $5040 (parts only now)

That does NOT include LABOR! If they are saying they can do BOTH engines (parts/labor/dyno test) I would say that almost sounds too good to be true! You said you had two 502's but didn't really clarify if that price is for one engine or both, but because it sounds too good to be true lets assume that $4600 is parts and labor for only one engine. Assuming you don't need new valve guides or machining for spring cups or anything else, here's a rough guess on the LABOR list:

$100 Remove pullies/dressing, heads, intakes, cams, lifters
$55 Degrease/disassemble heads
$125 3-angle valve grind
$34 machine for valve seals
$80 surface/mill heads
$250 bowl/pocket port heads
$50 assemble heads/set spring heigth
$45 degree in cams
$175 install heads, check piston to valve, intakes, carbs, dist
$100 remount pullies/dressing

Total LABOR (for ONE engine only) : $1014

Dyno time: $500 per engine

TOTAL cost for ONE engine including: parts/labor/dyno test is roughly $4034 (tax not included on the parts)

He's not too far off, but I may have missed something too! Get a parts and labor sheet from him with everything itemized with all cost of all parts, cost of machining operations, labor on assembly/disassmebly, etc.

BTW, I doubt you'll need 1050 Dominator carbs-----in my opinion, that's way too much of a carb for what you need it for---800's or 830's are good enough for what you're doing. :)

1050 should be fine without being worked.

Hell i'm makeing 550hp on my (mild)blower engine with a stock 1050dom and everyone keeps tellign me its too much carb for the engine. and i woudl ahve been fine with like an 850 or 900

Thanks guys - you've managed to put things in perspective for me and give me at least an idea of pricing/parts needed. After getting it up the a$$ on the long blocks I'm tired of getting screwed over.
But I gotta get in gear and get these things done - G-Force is in the shop getting a total cleaning from the sinking. The 454's are being taken out - so now's the time to do the engine/drive swap.

Kaama - I've got 2 x 502's that need work - and the guy said something about a "5 angle valve job"...
I was kinda thinking the same thing regarding the carbs - I was thinking 850's would be more than enough to do the job. The guy kept talking about what a great "fuel curve" he was getting with the Dominators.

I would think some about those dominators

oh yeah FYI my engine cost me $5500 and it was all new internals on a 30 over block add in the blower which i alrady had $1500 (cost me $1500)

Custom carbs.
 

A Nickerson stage 5 850 runs $895 and a stage 5 1050 runs $1095. For your motors a stage 5 850 will be perfect. For that kind of money I would go with some 310 Dart Pro 1 heads and sell the originals. More HP for less in my opinion. I have always bought my own parts and supplied them to the builder for him to put together. It is fun shopping and I know I am not getting ripped on parts. If you get the Nickerson 850 it is really unnecessary to dyno because he really gets them right on out of the box for your motors. My opinion!! Good luck!

I GUESS NICKERSON LAYS HIS HANDS ON THE CARB,AND MOTOR AND SAYS THIS WILL TAKE A 89 JET ,!!!!MAN HE MUST BE GOOD !!!NO HE OVER ALLOWS FOR FUEL ,JUST THINK WHAT A NASCAR OR NHRA TEAM WOULD PAY HIM IF HE COULD GUESS THE NUMBERS FOR THE JETS AND CIRCUITS ,HE'S IN THE WRONG JOB !!

NOT BEING A SMART A%& JUST TRYING TO HELP

KAMMAS RIGHT AND 850 FROM HOLLEY IS FINE AND THE PRICE FOR THE WHOLE JOB IS HIGH !!

SHOP THE PRICE THRU SOME MENTIONED ABOVE ,WOW THATS ALOT
GOOD LUCK !!!!!!:D :D :D

Both of you are right on the carbs,but he has built enough of then to know what engine combo's and location{sea level or do you live in Denver}to get the jetting and power valves almost right on the money, Hell I can take a box stock holley new out of the box, and make some minor adjustments and it will run ok on a lot of engine combo's. but if you are after every ounce some dyno time is called for

G, talk to Keith Brommelcamp. I believe the name of the business is Water and Wheels and is off Lilly Lake road just south of 176. I think the town is Lakemoore. He does alot of high perf work and has a good rep for being honest.

G-force,
It's sounds like this dude is WAY overcharging.
Here's a story...
Customer comes into my friends shop with a 311 Formula with a hurt (carb) . He want's to go faster.
So what he ended up with is his rebuilt shortblocks with new intakes , carbs , and cams. I believe a little port work and new Gil exhaust with all that and the labor I believe it only cost $8000.
These were not dynoed BUT the 311 went from 66 mph to 75 mph on GPS . We are guessing about 525hp.
So I think $4600 sounds a little high.