Well...
I was going to BERKLEY WITH YOUR MIIIIIINDS and bring a turbo diesel Miata to the Challenge.
I've got better ideas now. So, this freak that only the Challenge could create is up for sale.
In it: ~1990 Mazda Miata. Mostly straight body (rear got dinged a little), mostly complete interior. 1983 Mercedes 300TD engine. STRONG runner.
The engine has been mounted in the car, honestly all this thing needs to "drive" is a drive shaft fabbed, brakes redone (master cylinder and lines), and the little wiring required.
I will sell just the engine, but not just the Miata. (this actually is preferred. You'll have to help pull it, though...
Asking $500. The 300TD engine and transmission package often go for that! As always, trades are also considered.
Pics (excuse the leaves, we just had some serious wind blow through):

