Jon, I see what you're saying. I think I would be better off with the stock, flat-top L28 bottom end. As for the head though, my E31 has already been shaved (not sure how much though), its been ported and polished, and has a crane cams camshaft (I can find the specs on it if it would help). So I'm really just looking to changed out my P30 bottom end.
Pete, thanks for clearing that up. I don't want to have to run race fuel as this car will see more street time then track time. And we've got the 93 octane here in NC too.
Thanks everybody