As a side note, I've spoken to a few people and read online that there were ways to get the GM 350 diesels to be reliable. Head studs were part of the reciepe as I recall. I know they have a loyal following out there which enjoy the fact that you can buy them for next to nothing. I always wanted to play with one.
It was an oldsmobile 350 V8, and the block, crank and rods were reinforced, we used to use those parts to build very serious gas engines for drag cars.