You didn't mention whether you have a 5 speed or auto. Mine is a 5 speed truck with the same gears and 265/75/16 tires, so you'd be geared slightly higher than I am. Can't comment on how life would be with the auto, but here are my observations based upon 60000 miles of driving my rig. Whether or not the power would be adequate depends entirely upon your expectations and intended use for the vehicle. I did my swap just for the sake of having a fullsize truck with a small diesel to use as a daily driver. I honestly expected it to be a slug, and would not have cared if it was as long as the mpg was good. It has not (and probably will not) make my goal of 30 mpg, but I can live with the 26 -28 that it does get. Concerning power, I was very pleasantly surprised. With a good tune up (setting timing, valve lash, etc.), and some basic AFC tweaks, the acceleration is comparable to the TBI 350, and the bottom end power comparison is absolutely no contest in favor of the 4BT. If towing or big power are of concern to you, then you'd probably be happier with the 6BT, but I would be apprehensive about putting one in a 1/2 ton. A fully dressed 6BT weighs in excess of 1200 lbs, which would, in my opinion, be excessive for the 1/2 ton front suspension components. Also, even a stock 6BT could easily exceed the torque handling capabilities of the 1/2 ton driveline.