Your final compression ratio with depend on many factors such as what type of pistons you go with. Obviously a dished piston will have less compression, whereas a flat-top piston would have more. What you need to do is obtain the cc's of the combustion chamber of your heads (53, 54, 55, etc.) and then combine this with the piston your getting to get a good idea of where your finall compression will shake out. Rember that it also depends on where the piston is in the hole at TDC - i.e. how much below deck.
And, as far as the whole supercharging thing...well, I'm putting a ProCharger on my 331. So, I get the best of both worlds!
Good luck with your build-up.
E