I think I spoke with the seller of that truck right after it listed on craigslist. I think it's the same one. I was trying to understand how he diagnosed it as a cracked block. He said that it was not blowing steam out the tailpipe, but coolant was leaking out. He said it did not seem to be coming from the water pump area. He didn't see signs of coolant in the oil or oil in the coolant. He hasn't done a lot of troubleshooting on it.
Anyway, the motors turn up occasionally on eBay and at on the Isuzu P'up forum.
Jack
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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com