rearend swap

Hey rumblefish, did you run drums or disc conversion? My cuda has large bolt disc setup on front, but 7 1/4 small bolt pattern w/drums back. I can get another 7 1/4 w/large pattern, but I'm afraid I'll blow it to pieces with my combo, so anyway I'd like to learn if it is cost effective to do disc brake conversion in back. I am searching for 8 1/4 or 8 3/4 now, but alot of what I see online has no brakes, so at that point I could go either way, but I don't know how hard that might be, to put in discs, what is a proportioning valve? Thanks, Mr. 318, I'm right behind ya!