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ok need some input on this.  I have a small block 350 in a 75 chevy corvette i had a guy build what was supposed to be a 400hp motor.  They used flat top pistons with 4 valve relife basically a stock bottom end.  The cam is the Edelbrock RPM with 234/244 @.050 with .488/.510 lift.  They used the 882 smog heads with a edelbrock preformer manifold.  The car has headers with a 2.5 inch exhaust into dynomax mufflers.  The car has a turbo 400 with a 3000 stall.  Also a 600cfm holley carb.  The bottom is basically a L-48. My idea is to make this motor preform but on a budget.  My plan is to use

Vortec heads upgraded for .550 lift
Edelbrock RPM Air Gap
670 holley street avenger
This should be good for about 9.5:1 compression

or

L-98 Heads
Edelbrock RPM Air Gap
670 holley street avenger
this should be good for about 10:1 compression

Any help on input using the RPM cam would be appriciated.