using kbb.com as a tarded guide, you’d be lucky to get $4k selling it whole (I tried all the 91 240’s, fully loaded with 0 miles, and all trade-in/private-party/SRP options). IMO, your best option is to neuter the car and sell the balls. You might get around $15k total if you find enough suckers.
edit: but then again, you might get lucky and get some decent $$ selling it as a running work-in-progress.