$10K...
I would get myself into a late 50's chevy pick-up. Been cruising the interwebz lately for a crusty, ugly, driver version. Can be easily had for under $5k.
I have a buddy that used to build 355ci small block chebies for Modified Race Cars, has one with a 4-spd and a 12-bolt (makes 480hp) wants 3k for the driveline. Came out of his old 71 c10.
I would leave truck as is, crusty, and SLAM it to the ground with deep dish painted steel wheels (drab olive green or root beer) with white walls and call it a day.
I've thought about it once or twice