727 front drum / clutch question

Hey guys, I'm rebuilding my small block 727 and after disassembling it I found the front drum is only a 3 disc setup. I would like to upgrade to 4 or 5 clutches. I know you can get drums that are modified for 4 and 5 clutch drums. My question is are there any other pieces needs to do this mod? Are there any interference issues with a 5 clutch drum. This is a 1976 727 case. Thanks for the help.