The good news is that if it is seized badly, and you want to replace it, they are almost impossible to sell and therefore are very cheap to buy. Try for a few months to find a runner near you. The easiest thing to do, and least expensive, is put another in there. There is a small market for some of the parts off of the old one. Don't throw it away. If you are dreaming of a hot rod-ish type motor, go Chevy motor.
Here is another option to ponder if seized badly:
If you are not in love with this truck and did not pay a lot for it. Sell it as is. Plenty of Chevys out there.
There is plenty of hope left for getting it unseized. But you have to follow the suggestions re: Soaking and turning motor. Some people use Diesel oil? I think.
