brake question

i got a 73 and i put 85 k5 blazer axles under it its got disks in the front and drum in the back i was wondering i was going to do a power brake set up what would i have to do to make it work ? i really dont want to spend a arm and a leg but i want it to be done right . also would a 69 master cylinder work if i buy a boaster any info would b great thanks

 

I am no expert, but from what I have read you need a brake porportioning valve so the Disc/Drum setup will work correctly. As far as power brakes, my 75 CJ came with an OEM power drum brake setup. Last year the booster and the MC went south.. I ended up buying a booster/MC combo from Summit. BUT, the original booster is a 7" dual booster, and the one I bought was an 8" single.. I did some creative engineering to get it to work. Also the thread fittings on the new MC are different than the old MC. I had to find an adapter to use.. The new MC is a Corvette style.. I have since located a 7" inch dual booster, which I plan to purchase and install later this year. I don't know what size the fittings are on your Blazer setup, so I am thinkin you may have to run a bigger line, just something to check on.