Please help me confirm master cylinder choice

[Northern Goat]

I currently have a Wilwood disk brake kit with 13 inch rotors (front and rear) and the SL6R calipers (front) and SL4R rear, for my 1970 GTO project. I will be upgrading the front rotors to 14 inch, but I think this is irrelevant. I will also be using a 9 inch dual diaphragm booster and I need to confirm my master cylinder specs before ordering. I am looking at a master with a 1inch bore, the Front ports are listed as 12x1 BBL and the rear as 11X1.5BBL (not sure what the last two specs mean). Can anyone help to confirm whether or not this master will work well with my brake set up? Also do I really need to run a proportioning valve? Would prefer not to if I can get away with it. Just another connection that can potentially cause issues.