Erik, with a 4.155 bore, a flat top piston and a 76 cc head, I think my compresion ratio will be around 9.5:1. I don't really know how to calculate compression exactly but that is what the book that I ordered those pistons out of.

I got the 441 heads off of the old 350 that came out of the el camino. The valve springs are tired and the heads probably could use a surfacing and a set of guides, but i think i'll still get away cheaper than going out and buying a high dollar set of big chambered heads.

I'm looking for like an economized street car I guess. One that will make 350-400 horse and get around 12 mpg so that I can jump in it whenever I'm feeling froggy and run around town with it instead of my ol' pickup truck.