intake problems

hey i have a 355 ci first gen chevy engine with all forged internals and not a mile on it and i when i drop it in my bird and bring it to life i want pure power. i have an edlebrock performer rpm carb and manifold but the heads i was looking at are gm performance http://store.summitracing.com/partdetail.asp?autofilter=1&part=NAL%2D12556463&N=700+4294838998+400129+4294908216+4294840140+4294 889107+115&autoview=sku
ive been told that they will mount up to each other and ive been told they wont i just need a straight awnser will it all mount up and if not any ideas?

It's difficult to tell from the pics, but there are three variations on the Chevy intake flange. There's the "old standby", used from '55 through about '86 or 7 (depending on displacement, and what these APPEAR to be), the "throttle body injected" heads and earlier TPI heads (center bolt holes are at a diferent angle than the rest) and the LTx version (late LTs) with no holes in the middle.

The port "spread" is the same as far as I know, and that means any of the intakes can be modified to fit any of the heads. I would contact Summit directly, and ask them point-blank. Does it or doesn't it? If they say "no", send them back the intake or the heads, for the appropriate ones. Have THEM pay the freight since they sell "combinations" and proclaim a certain level of expertise...

We've modified the earlier ones to fit the middle ones. Haven't tried to put something aftermarket on an LT-1 or LT-4.

Jim