What cam to use.

Sounds like you have a lot of plans for that engine. The only way to know for sure, is to measure it, with the cam you plan to use. I would suggest this..You will want more static compression when the enige is naturally asprirated, or running the NOS sytem. I would be aiming for 10.5-10.8:1 with the .039 gasket. For a cam, I'd go like a Crane H-302-C. It's a little bigger hydraulic, but for NOS it will run like mad. Now, I would not run this with the blower. For the blower, I'd use thicker Cometic gaskets to drop the compression to 9.5, and run a smaller cam, most likely a custom ground unit with more exh lift and duration, and less overlap. using the lower compression w/o the blower will make the engine feel sluggish down low. Using the higher compression with the blower could be trouble with detonation. My $.02..