body swap to newer frame?

[Idaho64GMC]

I have a 1964 GMC that I've been driving for a few months now, I put a 350/350 combo in it and I really love this body style of pickup. My question is how hard is it or has anyone swapped bodys to a newer frame? I want a 6.2 diesel and have access to a complete 1986 GMC, I'm thinking it would be easier to put the body of the 64 on the frame of the 86 so that I'd have more modern brakes, the engine I want, rear end with less miles, the list goes on. If anyone has done this or has advice I'd love to hear it! This will be a long term project but I'd like to get the ball rolling. Thanks everyone