Frame swap questions

[Jaysonb]

I am working on my 71 c20, the front clip is off, the box is off, and the cab is stripped. I have to pull the motor to put new gaskets in. I have a 72 c10 parts truck that I was going to take the front cradle, and rear end out of, and swap the 5 lug stuff on to the c20. At this point would it just be easier to take the cab off the c20, and put it on the c10 frame? And if I do that, what body bushings do I buy, 3/4 or 1/2 ton. Thanks in advance for your help. I wish I could figure out how to post some pics! This truck has come along way thanks to all the great info here.