problems with roadrunner. need help.

gotta 71 rr, factory 383/727 car with 8.75 rear. the motor and trans were in the car when i got it, but the drive shaft was in the trunk, put a new u-joint in the rear of the drive shaft (part number 316) and it fits the drive shaft, but not the yoke.. and the other part number i tried that was listed for the car (315) fits the yoke but not the drive shaft.. its a 741 third member, not sure if its supposed to be there but dose anyone know of a u-joint that would work? the parts guys couldnt help me with this.
also, there was not an alternator bracket with the car, so i got one from my tranny guy, but it wont line up with the hole on the head, did the b motors use a different bracket then the rb's? or am i missing something.

Ask them for a "combination 7260/7290 ujoint" for a 70's Mopar, one half is small(7260) the other half is large(7290). Cant help on the bracket

Moog 347 NAPA NUJ240-0369 Auto Zone 2-0527 TRW 20226 A few conversion u-joint numbers from the 62-65 Mopar website.