I have a 5.0 with forged internals, gt40p heads and intake with a 80mm throttlebody and a n41 cam currently, its running 9.5:1 compression which isnt high but i found a twin turbo kit i want to put on it since its a quick power adder without having to stroke it, now I know I'm going to have to change the camshaft again, but with that compression i have to run a higher octance from what i found on the web. now how do i figure out what octane to use, say for 20-25lbs of boost? And how do i time the motor to handle the octane? I am super green to turbos and if im talking crazy please shed some light!! Its much appreciated guys!