[Buzz]

Pretty accurate looking narrow-hip body style which was not uncommon with some early replicas. Most manufacturers later modified their rear fenders as the SC look became de rigeur throughout the industry. I don't know of any older mainstream replica manufacturers who used a live axle, leaf sprung rear suspension. Arntz, Unique, Contemporary, etc. all used the Jaguar IRS. Factory Five Racing (FFR) uses live axles in their base kits, but that is definitely not an early FFR body or chassis. FFR wasn't around before 1995 or so anyway.

Fiberfab/CMC (later became Streetbeasts) used a live axle, Mustang based suspension, but that is not a CMC/Streetbeasts body. If I had to hazard an initial guess; especially based on the the cuts and cobbling in the way the body is mated to the frame, I would say that you may have a hybrid one off using a purchased fiberglass replica body on a modified/home built chassis.

I could be wrong so if I get a chance, I'll have a closer look to see if any details on the body or frame jump out at me and ring a bell.