as long as you tune your ignition and carb good you should be able to pull off 10.33 with 93 octane pump gas.
E85 (ethanol) is less corrosive then the drag racing alcohol (Methanol) so you just have to replace the 20-year old rubber hoses and clean out your gas tank and you should be good to go. I am going with braided stainless steel lines just for that added safety, and Im running an aftermarket fuel pump.
the nice thing about e85 around here is that it costs $2.20/gal... sure beats $6+ for c16 race gas to be able to run with that kind of compression.