BaT won’t accept a reserve on low-value, garden variety cars, or at least rarely do.
A data point. I bought my 77 Spider about a year ago. It had been parked for a decade, and driven only 67k prior to that. Pretty much zero rust, very nice paint and interior, dark blue+oxblood. Needed a top. Had the heavy bumpers.
I paid $3k for it, plus $1,200 for a hauler to bring it home. I’ve put around $6k into it, including CN36s, Eibach springs, red Konis, suspension renewal, early bumpers and grille reversion, new tank and sender, serious sound system upgrade, plus an ongoing variety of detail renewals.
So, I now have a brilliant driving, tight, good looking, rattle-free S2 for $10k.
The two variables on this car, both plusses, is that it is running, and has fewer miles. These argue for a higher minimum opening bid, but I recommend against using a reserve. Post an auction at, for example, a $5k minimum, and let it run a week. I reckon a smart buyer would compete up to around $10k, or more, plus the cost of a haul to bring it home.