Highest compression On B18A on pump gas?

Guys I'm looking to drop a B18A in my CRX and though I should talk to Teg people to see just how high compression I can go with this engine without detonation. High octane here is 91, and I don't wanna have to rely on Octane boosters.

I was thinking like 11.5:1 or 12:1 is this possible and reliable, also what other mods should I perform to make this as reliable as possible.

I am planning on a MSD Ignition, Crower Cams, Eagle rods, and JE pistons. (along with new bearings and stuff)

Thanks