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but since you car is a street car, i would suggest staying in the lower side as far as intake runners. this will boost low and mid range power.
it will be hard to beat the AFR 205s milled to keep the compression up. or you could go just a bit bigger and get the TrickFlow 215s, also milled.
more of a budget...some stage 2.5 5.3L heads would work nicely
Pick up the AFR 205s, like stated before mill em to keep compression up. THe AFR 205s plus the FAST 90/90 should give you a niice power increase and will be perfectly driveable.
Pick up the AFR 205s, like stated before mill em to keep compression up. THe AFR 205s plus the FAST 90/90 should give you a niice power increase and will be perfectly driveable. 
I have to echo this. My heads are milled to 59 cc's with a cometic .040 gasket. I have 11.5 to 1 compression due to flycutt pistons should be 11.8 to 1 without flycutting. You have a smaller cam and may be able to mill to 58 cc's without flycutting and get close to 12 to 1 compression. With really good (name brand gas Mobil, AmocoBP 93) gas you shouldn't have to worry about fuel issues. I know the throttle response is going to be monsterous and the torque is going to be awesome with high compression. If you are worried about PRE DETONATION then mill to 60 cc's and get around 11 to 1 compression. 11 to 1 will still be awesome throttle response. I know when my compression was bumped from 11 to 11.5 to 1 the torque went up a bunch and she responds instantly when given some gas.
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Volume as in cylinder capacity? Depends on the combustion chamber sizes of the head you choose, the gasket, and whether the head is milled.

