Dart driveshaft needed. Any info would help

Charrlie_S said

Putting a '74 motor up to a 63 PB 904 trans, requires a '74 flexplate and an adapter bushing for the end of the crank. (I have the bushing available for $20 shipped). I would recomment up grading your driveshaft. See link.
http://www.earlycuda.org/tech/ujoint.htm

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Did you mean I need the '63 flexplate on the 74 motor? I had an 85 motor in the car previously and it bolted right up. I didnt drive it more than around the yard though before pulling it back out. That motor was out of a pickup. I had the idea that the flexplates were all the same. I measured up the one on the 74 and its the same as the one on the 85. Measured it all up because they only go on one way. Thanks for any info.