While I dont have first hand real-world experience. The folks I worked with at Wilwood and the custom shop told me to use the 15/16" master. Thats what I have. "When" I wrap up that portion of the project I'll know how it behaves

1970 Charger - V10, 6spd, Alterkation, Street Lynx 4 Link, Moser Dana 60, Wilwood 14" disks, Forgeline 18" Wheels (Rear:335's), ISIS Multiplexing Wiring http://www.v10mopar.com 2012 Charger SRT8