5.9, max safe compression?

I am running 10.81 static, with 8.71 dynamic in a 360 mag with aluminum heads in a old heavy w150, the motor is a torque monster.
It has a small roller comp 262 cam and will pull my camper and car trailer easy.
I do mix 5 gal of 110 with 93 octane when pulling a heavy load because it is cheap insurance, I can buy it at the pump here for $8 a gallon, in a lighter car I would not worry about the 110.
The old truck pulls harder than my 5.7 challenger, but not as comfy to drive.
Just a old farm truck trailer hauler, but it flat out works.