New brakes, soft pedal, distribution blocks ?

brian6pac said

That is what I said, the smaller master with power brakes because the ratio is different and the master moves further and the pedal less than with manual brakes, that's why you need a bigger diam master with manual brakes to fill the 10 caliper pistons with fluid, and if you add a booster it wont take very much pedal effort at all to stop the car. But like I said it is a lot of brake for a light car so he shouldn't have a problem.

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That's not really right either. Pressure=Force/Area, that's all you need to know here

All things being the same:
A smaller master has more pedal stroke to deliver the same amount of fluid and therefore will feel softer
In an extreme case a smaller master may not be able to deliver the necessary fluid to stop the car without bottoming

In the case of the A-bodies, all the pedals have the same ratio, it's true there is a fulcrum on the booster that changes the ratio and therefore reduces the travel. In general you want a bigger MC with a booster.

In my case, manual brakes, you want a 15/16", your braking performance will be better.

I actually have hydroboost and have a 1 1/8" master cylinder on the car since it has a ton of boost.