If the 216 runs ok then I'd be inclined to run it into the ground ( you might be surprised how long that will take ). At that stage you can then make a decision. Even then there are options for the 216 ie alloy pistons and getting it machined for inserts instead of babbits. It also depends on how you use the truck. I regularly take the 41 on a 500mile round trip. I use it most days and travel 8 - 10000 miles a year in it. Change the oil on a regular basis and the little 216 will last a long time.
All the best
Bob
