I have a 489 BBC to replace my blown 516. I would like to reuse the cam from 516 if possible.
275/284 112lsa (Isky 39627584)
Holley 850
Dart Single plane intake

trying to decide what heads to get on a budget. Can get a good deal on a set of gm 088 heads locally but not sure if they’ll be sufficient enough.

any input would be great

Looking to get around 550+ hp

You're looking for a single set of 088 heads?

What do yoy mean by budget? Getting a used set of heads cleanup up could be more than new afrermarket aluminum.

I can get a good deal on gm 088 heads locally but not sure if they’ll be sufficient enough to reach my hp goals. The heads I can get locally have new valves and valve job done by machine shop. Ready to go on engine

088 heads were on the 800SC Merc Racing engine. They'll flow sufficiently for 600hp. The issue is they have about the worst exhaust port GM ever made. They also have the non-adjustable rocker stud system. $$$ to drill/tap for 7/16 studs....or use the ARP 3/8 to 7/16 studs.... but not the best option for the cam you'll need for 600hp.

What WOT rpm are you lookong at for 600hp?

088 rec port heads are very lazy...and have poor valve seat throats...so no real valve job shape. The only way to correct that is to put larger valves in. More work...more cost.

I have 2 pair Merlin oval port heads.1000.00 Pair
Ron 504-616-6005

If you are targeting 550+ hp, the 088 heads will work but will likely limit power without porting. They are okay for a budget build, but better flowing heads will make it much easier to hit your goal.

GM marine crate 454s with carbs and 088 heads...FT hyd cam 224/224 0.510" were 390HP at 5200rpm.

Not 100% on what the intakes were...probably iron. A good dual plane would help out there.

088 heads typically have factory cut valve seat throats that are just hogged out round and flat. Makes doing a quality valve job almost impossible. Increasing valve dia is an option...but 2.19" is very large already. The bottom of the Int ports is very low velocity.

Peanut Ports with a little bit of simple work would be better options...and can be had for $150/set used.

What compression ratio is it going to end up at ?
Personally I dont think that cam is going to be enough to reach your goal but I would call Isky and tell them exactly what you are trying to accomplish and see what they say.