5.9, max safe compression?

a 360 in a coronet i bought is loud and strong, idk exactly what's in it but i think it's a purple cam.
has magnum heads, i put headers on it and it has a crosswind (fake rpm airgap) with a holley. running 93 octane i haven't been able to hear it detonate (yeah, it's pretty loud though).

the PO told me it had speedpro flat tops (H116 i think?!?)
running numbers, best i could tell was the motor is about 10.3-10.7:1 compression.
pulls about 13" vacuum at idle in park at about 850rpm.
i tested a few cylinders for psi, cold motor it cranked 180-190psi.

so yeah, seems the magnum combustion chamber is pretty detonation resistant....
runs right at 180* temp on highway and cruising slower.