Welcome to the forum
It will be much easier to just put the 4x4 running gear under your original '63 frame. There is a thread on here titled "SixfoSuburban" by Jonzcustomshop, where he is doing just that.
Keeping it 2wd is also easily upgraded to PS and power disc brakes. It's just a matter of whether you want a 2wd or a 4x4.