New to V8's. 340 or 383?

Yes I do. Now, there's some math to do here. It is the tire diameter that is the last unknown couples with the gear ratio and the final drive ratio from the tranny, which is 1-1. This will give the engine RPM's at any given speed. Knowing this, you can start looking at cams that have a cruise RPM in the area.

I think I could target a decent cam for a general arena, though I'd like to be more informed before making a choice.