Hi I'm kinda new to this. I looked and I couldn't find the answers to what I was looking for in one of the threads. I have a 68 mustang thats got non power drums all the way around. I have the disk brakes and was about to buy a power conversion kit but found out that I either need a proportioning valve or a distribution block. I look it up but still am kinda confused about this. Whats the difference, what do I NEED to buy and how will it affect the car? (Its a 289 auto used to be standard...incase that helps) Thanks