rear disc conversion

OK, first I'll answer a question, sorry, I have 15" wheels, large bolt pattern.

It sounds like the upgrades I already made (from 13" wheels, 9" drums all the way around) to front power disc brakes and the larger rear drums, I'm not going to see much benefit going to rear discs. One thing I may need is a vacuum canister to hold more vacuum for stopping, as I notice when I brake sometimes it affects my idle. Of course with a different engine it may be OK, but my slant is pulling pretty good vacuum.

Anyone do a vacuum canister to aid breaking vacuum? I think these are easy to install, but I wouldn't mind seeing people's installs for ideas on can type/location.

Thanks all,

Brian