If it is in fact a matching number car with right engine and stuff, I would have a hard time not putting it back original. However, with the 65 I am currently building, I have found there is all kind of aftermarket stuff out there for these early A-bodies. My car will be kinda full tilt protour but since you may want to go back original one day, I would be careful doing anything I couldn't reverse. Just my .02
I have attached one of Kris's renderings to give you an idea though
