Hi Scott, welcome to the 'Bolt. Wow, good question on the engine choice. I'd say if you are pretty sharp mechanically & don't mind a challenge, the 4200 would be a real nice transplant(economy, power, etc..). If you are ready to get on the road & start burning gas, I would probably stick with the old school power...then upgrade to the new tech once you've gotten your feet wet. Just remember to not get in over your head & abandon the project. Sounds like a real neat truck you've got there! Do you have any pictures to show us?
