I've got a 1968 C10 with a 327 that's got around 370-410 hp and unknown amount of torque (guessing the same). It currently has a TH350 3-speed auto in it and a 2.?? rear diff. I wanted to see what suggestions y'all had for a swap that would better fit this engine and hp output. The transmission and rear diff are leftover from the 6 cylinder that was originally in it. I am looking for something that I can floor it and light up BOTH rear tires, yet a setup that also lets me run 85 mph down the highway without running at 4000 rpm. I'm trying to keep all of this at the lowest budget possible. Gas mileage isn't a concern either. I just don't want the engine running high rpms at high speeds unless I've got it to the floor. Kind of like a modern Silverado or Suburban. Except with an amazing ability to do burnouts lol! What setup do you think would help me get the best of those 400 horses?