Vellarossa Engineering made widebody kits for the 76’s that I used to own. I bought one of their kits, and had it installed. It really fit well, and looked good. I do not know if that is the proper spelling of their name, nor do I know if they are still around. Their widebody kits looked really good, as it only gave the car a more “hourglass shape”.
If I still had mine, I would put a RB20 in it to reduce the front end weight a tad, and still be able to get a good amount of power out of it.
Although, I used to have the 2.8 stroker using the Maxima diesel crank set-up with a turbo from a ZX. I really miss the car, it was fun. Maybe I will try and dig up some of the old pics and post them if I can find them just for shit’s and giggles.