Why not go for a Demon? Heck, the passenger seat is only a dollar as is the optional tool box. For $2 you get all those extras.
There was a guy that used to work at the Dodge dealer in Burlington Iowa and he was into the classic Mopars. He owned a 70 Challenger Plum Crazy RT with a 383 mangnum when they were brand new. He said at the time it kind of sucked. The paint went bad early and he wanted a 440 but couldn't get one so he opted for the 383. He had a lot of problems with it. The 70 I showed a pic of was probably nicer than when it was new, I had pretty much gone through the entire car and had it running and driving pretty good.
Good luck in the search, lot of cool colors to choose from. Do you have a color in mind yet?