Just got an a833od from 1977 for a 65 barracuda

What can I expect to swap out due to the 11 year difference in car and part, if anything at all.

(I assume you got it from an F) the f body pedals won't work and the z bar will be different. (even if it was a late A thought the pedals won't work) check to make sure the bell housing and clutch will fit as the earlier car has a smaller trans tunnel. drive shaft will be different and clutch rod might be different.
The trans should work fine thought as well as the shifter and rods.