How much compression can i have before i need race gas. I have 150 lbs of compression right now and i am running 108 octane to be safe, do i need it??

how come nobody knows this, any engine builders on here?

Nobody knows this answer because you haven't provided enough information. Psi developed by cranking compression is not enough to base octane requirements on. The compression gauge is only useful to compare a cylinder to another of identical setup. It comes in handy to check a cylinder against a known number. The parameters for octane requirements are: compression ratio, squish band, Ignition timing, and port timing.

Right on Andy. Plus, shape of combustion chamber, heat range of spark plugs, how rich it's jetted, freshness of the fuel, boost pressure (If applicable), altitude, engine type and design, cooling system effectiveness, duration of time spent at WOT, whether running at the peak power rpm or not, etc, etc, etc.

If all that's done is milling of heads, and you still have at least .060" squish clearance, you likely don't need 108 octane. Maybe just fresh 93 octane.

Install the Fitch fuel catalyst to insure that fuel is the highest octane/freshness.