What cam are you considering? Ultimately, what you care about is dynamic compression ratio to be low enough to stay away from detonation, not static CR, and the cam plus the static CR sets that. You have a heavy vehicle, so more care is typically needed for DCR.
You mention high stall and big cam so your DCR will tend to be lower with the big cam and you ought to push up the static CR as a consequence to avoid excess loss of low RPM torque. But that also depends on the use; the high stall TC hints that this is not a farm truck LOL. So what is the planned use and operation of this truck/engine?
