1965 body going on to 1975 frame 4x4 questions...

[Auctioneerhere]

A while back I saw a nice build thread similar to this topic but for the life of me I can't find it now.

I'm in the process of doing this swap now. I understand about the wheel base length difference. I'm going to leave the gap. {This truck will be a 4x4 pulling truck so it will bend & twist some so in the factory configuration it would just beat the cab to hell every pull.}

I guess I am looking at issues a person has run into doing this swap. I'm keeping the 4 speed.

Any thread links you know of would be helpful.