If the price sounds good to you then get it. I just bought a slightly rusty 90 Teg with an automatic that was in a front end collision for $500. It had some new parts on it and I have the body panels to fix it, so the price was right for me.
You can always take off the head and see what valves hit and just replace those, then put it back together. Since it broke at a stop sign, the head shouldn't be too bad.