late model bed on early trucks

[72dually]

Hello, Im new to the board, and Im hoping some of you chevy guru's can help

I just purchased a 72 c20 here in california, its completely rustfree with 102k miles, the cab and front clip are very straight, the bed is another story, it looks straight, but the other owner played cement mason with the bondo.
Anyway I saw a truck, 70-2 in one of the local truck traders that had a 91 or so dually bed, boy it looked sharp, and Im wondering if anyone has done this conversion, other than the dually hub conversion which Ive found on wheeladapter.com, are there any other issues that would make this difficult

Thanks Ken
69 GS stage 1 4sp
70 GS stage 1 auto
67 Nova Pro-charged 455 buick