Jaguar XJS restomod. Rip out the interior, wiring, and drivetrain and replace it with something a bit more modern and less Prince of Darkness. My thoughts on a donor car would be a 2002 Chevy Camaro. Interior would be mostly original, but probably have some Camaro switchgear in there. A good example of an XJS is about $6000, a shitty Camaro donor car in good running nick but with a body or interior not worth saving is probably about $2000.