Not the best way Sean, but I think I would first check to see if you can match the weight of the pistons that are in there..... See how close you can get, then if you're not experienced in balancing pistons have a competent machinist match the weight of the new pistons to the old pistons...This way the bob weight would remain the same and the rest of the reciprocating assembly will remain the same... Don't forget to have the rings you will be running with the new pistons, their weight effects the bob weight, too.

As for an intake, I have had very good results with the Edelbrock Performer RPM on street engines....but I also keep wanting to try a dual plane Weiand, can't remember the name of it right now....