changing frames

[westofb]

I have a 69 chevy long bed fleet side, am really wanting a swb truck and I have a 84 chevy swb frame. has anyone made this swap before? I realize the frame on the 84 has a 2 inch longer wheel base that a 69 swb, but I think moving the rear axle (springs and mounts) 2 inches forward would not be that big of a deal, just cutting off rivets and redrilling holes 2 inches forward. What I am unsure about is the width of the frames under the cab, the 84 is out in the snow and I don't really want to climb under it at this time to measure, but looks as if you could cut of the frame mount for cab mounts on 69 and bolt them to the 84 frame with little problems as long as the frames are very close to the same width under the cab portion of the truck. Any ideas or suggestions....thanks