Haven't seen Sweet Revenge since the early 80s. I remember finding it very entertaining, and was really drawn into the two lead characters: The thief and the investigator. Perhaps the premise is thin, all the effort just for a car, but surely many people have obsessions with cars. I know people who seem to love their car more than their spouse.
Stockard Channing was amazing, as was Sam Waterston. I'd love to see it again.
Sadly this movie is not available on VHS/DVD nor on cable. Any interest in reviving it for a discount renter have probably gotten thwarted by the fact there are 6 other movies by this exact name listed on IMDb, so just knowing which Sweet Revenge one is talking about is tough. The 1984 movie of the same name plays on cable all the time, but never this 1977 title. Like other movies from the slightly pre-VCR-boom era that I'd like to see again, including 'A Man, a Woman, and a Bank' and 'The Manitou' (which was bad/silly but worth a rewatch), it may not pass this way again.
If you should actually come across it, it's worth checking out. (And then let me know where the heck you found it!)