Rearend swap?

[mkmc69]

I have a 67' short bed step side that I am just getting started on. I would like to convert to 5 lug from the current 6 lug setup. I have already aquired a complete 86' frame with suspension. I have the chance to purchase a rearend from a 71' GMC which has the leaf spring suspension. So I guess my question is what would my best option be keeping in mind that I would like to retain the coil spring setup. Should I use the rearend from the 86' and attatch my coil spring perches to, would the 71' rearend be better? Also would like to know if I could just swap the axles from either the 86' or 71' to the 67' housing? Thanks for any info!