gotta be an early one with that companion flange I have a 62 complete burred somewhere was for a 62 Plymouth 2 door wagon project- (was 318 poly but I had a year correct 413...
car got stolen but I still have the rear side glass and tail gate glass if someone needs it
was a 3 speed car- the BIG 3 speed like came in early Max Wedges (to stay on topic)
there are those that can help with the numbers but I'd
count the splines and post
measure the bell-housing hole and measure the trans front bearing holder and see if they are the same and post the dimension(s)
good find