I believe the car was done by a dealership named Savage.
It had some add on bodywork, [spoilers/flares maybe]
I think most were 340 cars. The suspensions were set up for better handling/ weight transfer. The steering wheel was proprietary. The engine came Dealership tuned. There are several more modifications I don't remember.
I read an article about one of the originals - but kept more original than this one- several years ago.
Seemed to be a very potent package.
Sort of like a Tasca Talladega [Tasca Ford, Rhode Island] , or a Balwin-Motion camaro [Motion Perf, Long Island , New York] .