[1971gophercatcher]

I am currently converting my Power Front Disc Rear Drum brakes to hydroboost on my 71 Cheyenne Super. I pulled a hydroboost off a Astro Van. My question is do I need a Proportioning Valve for this new setup?

I am replacing the master cylinder and power steering pump. (Going new on these that would go on 1982 3/4 ton suburban diesel)

Thanks a ton in advance.