Swap a 72 K-member into a 71

Will the K-member work without any modification, or at all? How about the rear-end and leaf-springs? I put a 440 and 727 into a 72 along with an 8 3/4 and SS springs. Now that it's come time to paint it I've found a better and much cheaper 71 to be painted the color I want including the engine bay which I was going to have to do later when I put an Alterkation in. So now the obvious solution is to unbolt the K-members and rears and swap them out. Are there going to be any gotcha's??

Thanks
Gary