I'm going to be running a 700R4, which should bolt up just fine (some of the 4BT's had a chevy 4spd or TH400). Going to Run 4.09 Gears with 33-35" tires. I figure my RPMS will be in the 1800-2200 range for highway speeds 55-70mph. Should be within the operating limits of the engine. The main concerns I have right now are going to be the TV cable on the 700R4, the intercooler for the motor, and the actualy weight of the engine. I want to keep the stock SUA springs with a 4" lift, but the additional weight may require me to engineer up something a bit different. I'll let everyone know how it develops out, so for now, I'm on a hunt for an engine locally.