My P-15, for the most part is stock. My recent addition to the car was an aftermarket fuel tank because my original was going to cost too much to fix. When I first got the car, my plan was to keep it as original as possible, but as time went on I decided to enhance a few things, but still keeping the original look, inside and out. I really wished that I had dropped a 350 small block engine in instead, which I will do when the straight 6 has run it's course. As time wears on, the parts for these cars are getting harder to find, and many of them not being reproduced like for Chevy and Ford. My theory now is, "What you can't see under the hood and car won't hurt you."