Unless your after the cool factor, I wouldn't put on rear disk's. You don't need more rear braking. If you do go with them, install a adjustable proportioning valve, I have installed a few to fix the problem with others that have done the same, when their cars rear end locks up to easy, and or pass's the front end under hard braking
I bought my front disk kit for my '57 chevy which came with everything including rubber hoses, and new bearings to convert to roller bearings instead of oem type ball bearings new for $265.00 off ebay, from a guy that has a ebay store. (don't remember who anymore)

Just my .02 worth.

Pat