"First build", "low compression", "street" just seems like making things very hard on yourself with a tunnel ram and a lot of carb. If you really want to keep the tunnel ram, I'd dump the 750's for 500's trying to get some vacuum signal. Dyno numbers are great, but throttle response is important for street driving. Large plenums, long runners and large carbs is not a recipe for good throttle response.
You can deck the 452 heads .050 and have the intake face cut .060 to maintain manifold alignment, this "should" take a 452 chamber to around 80cc's, which will buy you a little more compression. If this is economically sound depends on the costs of machine work in your area. Often the costs of getting iron heads properly sorted out is about the same or more than just buying a set of 440 source or eddie heads. With the TFS heads coming out, there will be some ppl moving up and selling their source and eddie heads. Often used parts are junk, but new parts need to be checked too. S/F.....Ken M
