Master Cylinder Size

I went with 15/16's. I had a MC that was a bit smaller and it took a massive amount of pedal pressure to stop the car. This MC I have know doesn't have too much travel but I found it's a bit of a trade off with pedal travel and stopping without using both feet! I'm running SSBC disc up front with 10" drums out back. on a 72 Demon. I'm sure everyone has there own opinion but it's really what you personally like. But I think the 15/16's MC is a good starting point.