How original have you kept yours and why

I've always preferred that the real muscle cars be left "stock" and by that I mean not modified to the point of no return, or modified with no regard to the history of the car (ruining good, valuable parts or hacking a car too badly). There are plenty of garden variety muscle era cars out there that can be made into the hot rods and street rods. No matter how much a car is worth in stock form, a modified version ~usually~ means it's worth less because it appeals to a narrower audience. It's your car though, if you plan to keep it, do with it as you please.