Mopar B pillars are slanted. That is not something people would change back to straight.
Grill looks like a caddy, but that 49 grille is awful close..
Car has been chopped and lowered.
Items to compare are the hood to fender lines, the vestigal running boards, and the trunk lines.
Even the hood bulge from the front could have been added, although that would be a lot of work.
46-48 Chevy has the straight B pillars, but the fenders extend into the doors.
Other GMs have slanted posts.
The big giveaway is the way the trunk meets the greenhouse.
Take a look at this 46 Ford and compare the running boards, the greenhouse and the way the trunk lines up.
http://www.gohotrods.com/46ford/presta46.htmThey did some major work in front, but I think that's it, 46-48 Ford coupe.