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Just weld it and you should be good, I build many custom frames, and I woudn't swap it unless you had extra $. I would spend some time to find a good welder, its not as bad as some i've seen and fixed. If your wheeling it and not pushing 500+ HP, it will be fine. email me if you have any questions...
Its becoming commonplace to stretch frames when customizing big trucks now. I've seen wheelbases as high as 386". With 550hp, 2000lbs of torque, and gross weights up to 80,000lbs, if they dont break on us, they wont break on you.
all the 80-97 F series rear springs are the same width, 3"...and the same length of about 56". I was just out today measuring my '90 Bronco, '90 F150, and '96 F350. I need to build some rear spring packs for my lift, the only difference is the thickness of the spring. The 1/2 chassis trucks are made out of thinner material.
I say just weld the crack and plate it. All three sides...and dont skimp out and only go 2-6" on either side of the crack. Make a spread of 18", so 9" from either side of the crack, and do the other side while youre at it. It will strengthen the frame, be cheaper, and easier than a frame swap....unless you were about to do a whole bunch of custom chassis work, then I would say get a donor frame to build, and then put the body on.