1970 dart swinger shell for parts or race car?

I have a pretty well stripped 2 door 70 swinger in Sacramento CA. It has great floors, trunk floor, and lots of other good metal: doors, trunk, hood, quarters, tail panel, etc. Rust free CA stuff. Also has factory front disc brakes. No drive train, no interior. No rear axle.
Asking $400 as is, or for $550 I can install a 7.25 rear axle to make it a roller. Let me know if interested.