[smashingchuck]

First off, nice truck.
There is just no way you are going to get 300 HP at the rear wheel with a TBI set up without major work. That is a ton of rear wheel horsepower and there are very vew if any members on this board that are making that much horsepower at the rear wheels let alone using a TBI set up. That being said, I would keep the TBI set up, put a bigger throttle body on it, a mild cam, some good flowing heads, have someone who knows what they are doing go through that 700r4, and start looking for some decent axles. As long as you have it apart I would have the motor bored (at least .010) just to clean it up and throw some flat top pistons in. Just my $.02.