Not sure what your question is.

I think if you're gonna sell it outright, you should replace the engine first. With a busted engine, most people will take the average 1999 price and subtract cost of a new engine and subtract another 1000 for getting the car around and the headache to them. With the engine, you can get top dollar, because it's effectively got 0 miles and none of the 1999 engine issues.

If you're selling it without the engine, expect to get about 5-7k for it. With a new engine, maybe as much as 11 or 12k?

This is my opinion, of course, and isn't based upon any experience or knowledge of the true statistics. It just makes sense to me.