Can you use a 1963 tranny off a gmc v6 305 big block to a 73 Chevy 350?

the 305 isn't a big block, as far s i know. for the most part small block engines have the same bolt pattern at the bell housing. to ck my answer try to search for bell housing bolt patterns ect. good luck.

Actually the 305 v6 IS a big block....

Actually in 1960 in Chevy/ Gmc trucks they started putting a v6 in trucks it was a v6 305 Big Block. I have one in my 1963 GMC long-bed. It is a rare motor and hard to find parts for.Yes you can use the 63 transmission and bolt it up to the 73 350.I am putting a automatic turbo 350 in mine and it bolts right up.