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You should be able to look up that value right here at Edmunds in the nifty True Market Value section. Here's the link:
Nice engine in that All-trac.
If you really want to sell it, you may want to advertise it on one of the Allitrac websites. The general public doesn't know much about these cars but the enthusiasts have a hard time finding a decent one, so you may get a better response there.