Max compression for pump gas iron head

I have a very similar setup to Dave. Mine is a 360 +.040, zero decked flat tops and Magnum heads. My cam is a Comp Cams Magnum 280H. My compression works out to 10.58 to 1. I can run 89 octane with no problems and 87 in a pinch. Remember though that I am in Canada where the octane is rated different. 93 in the US is the same as our 91.

Jack