Fishy, I am using a 8.25 that is in the car with 290 something gears, going with 355's, mild cam and a torker ii and a 750 eddy and a voodoo cam, shumacher headers and install package.. Prob never going to the track, just a fun 4 door sleeper., might leave the small pipe from the six going out the rear. Just have to figure out where I want the dual to come out of.