Hey I saw that ad!

Sounds like a good deal to me. If your going to do something serious with the engine you'll want to rebuild it anyway or at least get it checked out, no matter what the previous owner says.

You get to drive it before you buy it which is a LOT more than most people get before they get the engine. $600 sounds like a really good buy. I paid $800 for mine, and while it was the friend of a friend it apparently runs, but will need a rebuild pretty soon, although mine came with a t28bb turbo.

Make sure you get as much as you can from him, from tail shaft to intercooler.