You name a problem and I probably have it in regards to the brakes. Because of the cam in the engine I needed to get a vacuum pump for the brake booster. I bought a vacuum pump from summit and hooked it up to the booster and still no power brakes. I ordered a reman booster from summit (a Cardone). For the first hour or so the vacuum pump would cycle on and off when I would apply the brakes (this is as I am trying to bleed, not while I was driving since it is not really driveable without brakes). After around an hour the pump just kept running. I disconnected the check valve from the booster and put my finger over the check valve hole and the pump stopped so the leak must be coming from the brake booster. I have a manual brake pushrod and manual brake firewall bracket in my attic. I am about ready to pitch the entire power brake idea and go with manual.
Anyhow, the car sat up in my garage for about 1.5 years as I was doing some body work on the car and also did a swapover from auto to 4 speed. One of the front calipers froze up so I decided to change both front calipers. I ordered reman calipers from summit and changed them. I also ordered a reman master cylinder. I don't know the bore size as it doesn't say on summits website like it does for most other master cylinders. The one I ordered was
http://www.summitracing.com/parts/AAZ-10-1323/. Somehow I ordered the drum brake mc instead of the disc brake one. Now, I pump and pump the brake pedal and it never seems to get hard.
I am not running a proportioning valve. I am only running through the little stock 5 port brass metering block or whatever the block is called.
The tires are 265R15something or another. Nothing too large but a little bit wider than stock.
These brakes are about to drive me crazy. I thought brakes were supposed to be simple. That is why I am about to pitch the booster and vacuum pump. Maybe I got too much clap trap. Maybe if I simplify it will get better or maybe the problem is that since I have brakes that are non-stock, I need to do something different with the master cylinder.