What is this type of car called?

Sold my 73 Scamp to some good ol boys down here in south Mississippi. They have already cut the top and started the reinforcements. Here is the kicker: they are making it into a ratrod looking contraption. You know the look: Junkyard patina, side pipes, 500 HP. It ought to be interesting.

I will get pics when I can get over to see it. I like the idea. Waiting to see the execution.