1960's 727 trans verses 1980's 727 trans

I still need a 727 SB trans for this 1968 Barracuda with a 340 engine, there is a guy near me with a 727 SB trans that was pulled off a 360 motor from a 1984 2 wheel drive truck. Will this trans bolt up and work for what I need, I know I will have to go through the trans before it is installed but just want to know if there is a difference in model year trans's.
Thanks
Bob