Upgrading to 11.75” discs on the front?

I'm running a complete 73 A body front suspension with 11.75 rotors and slide calipers. I would rather have the pin ones but I had the brackets sitting on my shelf.
I used the shields again cause they were on the shelf. I'm using a master for an 80 Grand Fury 1.03 bore and also have GM rear calipers. IIRC the lines were for 73 A body. Pedal is a bit spongy but stops well. Thought about trying a 15/16 master. 20200113_174152.jpg 20181123_134056.jpg

20190309_104348.jpg