It's not common knowledge, but you can just run SpeedWeek for the fun of it. The Compressed Air Roadster class has a lot of persnickety engine rules, but a lot of them can be overlooked until you get in Impound.
I've seen under-displacement cars run and now hearing about DeSoto, Edsel and others being entered – kinda what the class was designed for years ago. As to them holding the record – well, we'll see.