Brake Advise

I have a '70 Sportsroof that needs help in the braking department. When I bought the car it had manual front discs and rear drums. I needed to really start on the brakes to get the car to stop at all so I upgraded to power brakes but didn't get quite the positive change in braking I was hoping for. I think that part of the problem is that my cam doesn't generate enough vacuum to power the booster. A friend of mine is running a manual brake system with a dual piston master cyl and 14" Willwood discs up front and stock drums in the rear and has great braking. I'm thinking about doing something similar but don't have the $ for Big buck brakes like that. There are a number of systems available using 11" rotors with 4 piston Kelsey Hayes calipers but they all adapt to drum spindles. I'd rather not spend $300-400 for new spindles but can't find a system that works with disc spindles. Any suggestions on how to increase braking without breaking the bank would be greatly appreciated.
 
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I added a vacuum reservoir tank on my 302. It's a black can with one hose from the manifold to the can and the other to the booster. It works well. I bought it at Summit Racing with a gauge. It was reasonably priced. And the braking power is very strong. The can stores vacuum as the engine is revved up and down. This could be an inexpensive solution for making your braking system perform better.
 
start by making sure you have the right master cylinder. if the master cylinder is not sized properly, it will cause problems like too hard of a pedal, or too long of pedal travel.
 
Master cylinder came with power brake kit for a '70 so I believe it's correct. I may try a vacuum reservoir to so if I get any improvement and go from there. Still surprised that even brake upgrade kits all us drum spindles. Surely other people with stock disc brakes upgrade .