I believe that the F100 is a short box and the 150 is a long box, the frame will be longer I think, but if you dream it ,it can be done,depending on how much work you are willing to do..

I have talked to Salvage yards and Dealerships but their records dont go past 1982!! %$#*&^% no good ^%*&$#*&'s I guess i'l have to find a 79 and do it the hard way...