I had a guy last year trying to buy Robbins old RR, but current owner wanted a fortune for it. Then he wanted to buy my GTX, then he was just looking for ANYTHING. Most guys are looking for small tire, stock firewall and front end cars and they just aren't out there. At least not nice ones.

If I had the extra time and money, I would build a nice small tire Mopar chassis. Could likely sell it real easy

Big tires doesn't hurt your car, because many classes that doesn't matter about the rear end. But isn't your motor moved way back and different front suspension? That likely hurts it