It depends on what you want the car to do. You could keep it 3.8 or go to 4.2. DCR will be based more on the piston design than shaving the heads. There are really no aftermarket parts like the V8's, but there are specialty companies out there like SSX. We might be starting one up soon to build motors, but that is a few months off.I wanna rebuild my 1994 V6, and use aftermarket performance rotating assembly. Does anyone know where i can find this. I have tried looking and all i can find is stuff for the V8.
P.S. is it ok to shave the heads for more compression?