360, You think it'll run on pump gas?!?!

That's really going to be iffy. With 93 it might run ok. Might. You really need to know your dynamic CR. That will tell you a lot better if you can run 93 than your static will. Overlap in a cam will help a lot. What is your cranking cylinder pressure? I plan on running pump gas in mine. 11:1 iron heads with a cam that has a decent amount of overlap. Dynamic CR is 8:1. We planned it this way to run the junk 91 around here but I'm going to have to pull the timing back to get there without pinging and lose some power. Put some race fuel in and advance the timing and I get all of the power back. My engine guy was telling me about some head gaskets that they make now where you can add quite a bit of thickness to them to lower the CR if needed. I'll ask him what they were if you need to know.