'62 Frame question

[nailm]

I have a 62 Chevy Short bed stepside. I love the truck and have big plans for it. (more plans every time I come back to this board!) The problem is, almost all aftermarket I find is for 63 and up. I realize that there is a difference in chassis. The front suspension issue can be overcome relatively easily with a donor front x-member, but what about the giant X through the rest of the frame. It seems to interfere with all rear suspension options. WHAT CAN I DO!!!. Will my 62 body drop onto a 63+ frame? Can the X be cut out and replaced with other crossmembers more in line with a later frame. Anyone face/solve this problem before? All ideas GREATLY appreciated.