My "T" bucket weighs 1600 lbs. With VW disc brake calipers front (10 in. rotors) and 10 1/2" drums rear. When originally built, I used a fairly large (1-1/16") master cylinder. I did not like the pedal effort and after a few years, went to a 15/16" master. The car now feels like power brakes!
My T weighs 1,550. I have the brakes and rear-end out of an S-10, with discs on the front (Wilwood), 1" manual MC, and it has plenty of stopping power. If you have disks on the front and drums on the rear, make sure you put a proportioning valve in the system so you can adjust the front-to-rear brake bias if needed. Good luck to you!!