If I were to acquire a forged stroker kit, upgraded heads, and stage 2 VT cams, possibly some suspension... how much PSI could I safely run with a KB intercooled?
it will depend greatly on the CR of the engine and what grade fuel you will be running, else you will not be able to control the a/f safely.
If the CR is high and you are runnig 91 octane fuel 6psi maybe all that is safe.
If you want a s/c then have a look at the different ones available, I think most recommend a CR of 8.9:1 or there abouts, if your new engine is 10:1 region it will be a great n/a setup but bad for boost.