I would consider an overdrive transmission and a 2500 +- stall. I agree on the rear end ratio and the possi, Eaton is a good one. Someone else might chip in and advise you on some tricks for your rear suspension; shocks, bushings etc. After you get that done I would install the headers and dual exhaust, Edelbrock also has some good mufflers. I like the Aerochamber. My 2cs worth.