[Keithc8]

This truck is a perfect candidate for a 408 Windsor. The kits are real reasonable for them with the cast crank, I-beam rod and cast pistons. I think we can get you a complete kit with bearings and all for about 1000.00 or less.
This would be a much torquer engine for the heavy truck you have. Do the 408 while you have it apart and it will work much better.

Good luck, Keith Craft