Re: long box to short box -frame ?
You need to take 12" out of the frame under the cab, and 8" off of the end of the frame. I believe there is a link in the '60-'66 FAQ Index, to a thread on shortening the frame. I should have pics on one of my computers of one of the ones I have done. It takes some time, equipment and the skills to do it right. Shortening a frame isn't something that should be attempted by a beginner welder/fabricator.
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