Lets play the HP guessing game
 

Im doing some upgrades to my engines. I have room to mill the heads down to get to 9.2:1 if need be but considering blowers in future as well
Spec:
Gen VI 489 Strokers Compression 8.5:1
Scat Balanced Rotating assemblies
Icon Flat top pistons w/ 3cc single relief
Victor JR Intakes port matched
Quickfuel 750 Carbs
Enginequest 320 heads with manley severe intakes 2.25- 30 degree backcut ---Exhaust ferrea tulip 1.88---- comp 930 springs
Comp XM284HR cam 230/236 .547 .547 lift
Pertronix Distributors
.020 in hole
.020 SCE Shim Head Gasket

490-500 with 9.2 cr @ 5,500???

More cam, carb "950", compression and port work maybe another 50 hp.

550 with 9.2

Almost forgot exhaust is gil dry to tip. Numbers seem decent. I like the acceleration this cam give me. Would it be worth it upgrading the carbs still??

More carb will help you up top. BBC marine engines like carb. Personally I wouldn't put anything less than 800/9022 Holley but it's not like the 750 wouldn't work. Also the 731/741 cranes work well 489/496's. You've got a pretty conservative but reliable build listed.

Ya its nothing over the top. Compared to the vortec heads on there now im hoping to get a good kick in the butt. My flow is going WAYYY up but my compression went from 9.6 to the basement from head swap

531 but with more cam and a bigger carb 50 more is not out of the question.

Cam specs are close to 454/420 hp if I remember correctly. The 284 has apprx .020 more intake lift. I hate to go beyond what you asked in your original post but if you have dry exhaust and are going roller your sure you don't wanna deck your heads and throw some more cam at it. But regardless you'd have a reliable 500 hp plus or minus engine.

It is roller currently. Im probably gonna mill the heads if I dont find blowers. I am limited by piston to valve at 9.2
Duration: 284/290
Lobe Separation: 112
Duration @ .050" Lift: 230 236
Intake Centerline: 110
Valve Lift: .547 .547
Lobe Lift: .323 .323
ATDC 31 BTDC 32
BBDC 79 ABDC 72