Friend with '48 Chrys. P-15 wants 60's rearend

I've recieved great help from members who have guided me through my '65 GT full resto, and maybe someone can lead me in the right direction to help a friend who has been restoring a '48 Chrysler P-15 that has an ancient rear end design and he says that he's heard that some mid sixties Chrys/Dodge models perhaps a cuda should work for his 4.5 bolt pattern? Anybody out there who knows what he needs?