65 Barracuda 4-speed???

The '65 will also have the weak 7 1/4 rear end, verses what is already in your '74 (an 8 1/4, I believe).

I would highly suggest you look at another donor car. That 65' tranny will also have the trunion rear fastening for the drive shaft, rather than a U-joint.

Big differences between a '65 and '74 A-bodies!