How original have you kept yours and why

I have two cars for just this reason. My Barracuda is an original big block 4spd. car but already had the original engine replaced when I bought it. Since the original engine was already gone I went ahead and installed what I wanted to in it. I also changed the trans to a five speed but I haven`t tubbed it or cut the fenderwells out and don`t plan to. It`s the car that I have my way with. On the other end of the spectrum I`ve got a 68 Dart GTS that is an all original, matching numbers car. I`ve sympathetically restored it to as original condition as possible. This is my way of having the best of both worlds.