67-72 frame and suspension

[bigbluthng]

i have been looking for a 67-72 swb fleetside for quite a while now, but the only ones i can find in my price range are longbeds. i read an article in custom classic trucks where they shorten a longbed. also somewhere i read that the suspensions for 73-87 are almost the same as the 67-72. is this true? if so i would plan on buying a longbed 67-72 and using a shortbed frame from a 73-87.(i have access to one that rolled, but the frame is straight) otherwise i would shorten the longbed. my overall plan is to have a 67-72 swb fleetside slammed.