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Can something like main caps be reused? The oiling sytem for example? Distr. gear?
The second question is what is the most the compression can be if the gas is 91 here?
How much compression can I use with aluminum heads and less timing?

Mainly street driven? Main caps yes intermediate shaft I'd replace. Get a new Melling std vol oil pump. Keep 3/8 pickup if the screen cleans up though they are cheap, baffle the pan. #1 You must get .035"-.040" quench which requires CAREFUL measuring as the piston rocks at TDC & clay is not accurate enough & that clearance is a small window. If quench you can run a CR in the 10's easily w alum heads & probably somewhere in the lower 10's w iron heads

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