Long tailshaft 727?

Thanks, I was wondering about the yoke assembly. I'm also swapping out the rearend for an 8 3/4. I didn't know the long shaft 727 was for cars, thought it was the other way around. I don't know if I can find the right driveshaft but getting the one I have shortened isn't a problem. Not sure about the yoke assembly though, can that be swapped out too or is it too big to fit into the current driveshaft?