Yes.....somewhere in that neighborhood on the compression......using the right combo and cam selection this is very doable......have run many hot rods with numbers in this range without issues......heat may be the only one, due to the Coupe having a smaller radiator, but it is a 4-core, so maybe not too much of an issue....along with an oil cooler. Talking with AFR, Ive decided to just bite the bullet, shave the heads for a 58cc chamber and use flat tops, then no interference issues on that end. So.....need to cancel the domes and replace with the flats. Oh.....here in the southeast, 93 octane is the norm by the way