Need truck advice

I would tell him that you want to start it up cold. Then drive it to be sure on the tranny, and the 4wd. You wouldn't need to drive it but 1/4 mile to know if there is anything major. You won't wear the 318 out. It may not have the torque you hoped for when towing, but it will pull. Just don't try to hold 60 up all the hills.