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What you're concerned about is called pedal ratio. Pedals designed for power systems generally have less mechanical advantage built into their brake pedal, so if you use it on a boosted system, you may have a very sensitive brake pedal. Where is your master located? The reason I ask is that I'm just wrapping up a master-cylinder upgrade on our '58 and learned quite a bit in the process. What I didn't learn was how long Olds had the master in the location that mine is (was). It was located directly below the steering, as opposed to up high on the firewall like more modern cars or under the floor like most earlier cars. I converted mine from the stock single-channel power master to a later (1967 Olds 88) dual-channel manual master. I did my upgrade for a couple reasons.
1. The stock power brake setup on the '58s (Treadle-Vac) is NOTORIOUS for failing, even when rebuilt. They stopped using the Treadle-Vac in '59 for that reason.
2. I wanted a dual master so that if I blow-out a line, I only lose the front brakes OR the back brakes as opposed to BOTH. The government made dual-channel masters a requirement in 1967 and there are issues in using disc masters on drum setups, hence I chose a 1968 88 master. The fact that I got one rebuilt shipped to my door for $29 didn't hurt either.
3. I wanted some vaccuum back as my car has vaccuum wipers and I've got a tri-power J2 setup for it, which will further reduce the vaccuum, so I decided to try out the manual brakes.
What I did learn was that my pedal came out with three bolts as an assembly with the master removed and I was able to move it over an inch and down an inch to get away from the steering.
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