Rings?

I like using the Total Seal Gapless piston rings. Yes they are file fit but a machine shop can do that for you and really your not going to get any better then a file fit ring
Also if your going to super charge it you might as well EFI the thing for better all around performance.

Seeing how you said you have forged pistons, I'm assuming you have a 1/16, 1/16, 3/16 rings needed.

I used the street and race one on this page for my .030 340
http://www.summitracing.com/parts/TSR-T7590-35/

However this might be better for you because you're super charging the motor. (recommended for you app)
http://www.summitracing.com/parts/TSR-ML759035/

This is the upgraded set of the ones I recommended for your motor.
http://www.summitracing.com/parts/TSR-MS3690-75/