360 build, hp and compression thoughts!

chris17 said

Hello Rick, yeah the heads have a casting # of 3418915 if that helps. I know I should have c.c. them but hey, if that's the only mistake I made I feel like I did ok. The rearend is the peanut 7 1/4" with 2.76, I am thinking of changing that to a 3.91 ratio when I come up with the 8.25 or 8.75. It seems to run great, yep I have been playing with the timing and I think I have it nailed.thanks for the input.

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The 915's are "J" heads and the chambers are around 72cc's stock. With just a mild deck cleanup, i'd probably figure about 70/71. At this point it's not really a issue, you got a nice pump gas engine with the 150ish cranking comp. As far as the gear, 3.91's will give you more performance, but if you run across a 3.55 for sale at a good price, i wouldn't turn it down with your current combo. Now if your thinking of some intake, carb, cam upgrades in the future? The 3.91's might be the way to go?