Not sure if this will apply or not. I did a SSBC swap (put discs on the front),,and had to change the MC,,,
I have manual brakes.
I went with a "smaller" bore MC,,,,and used a 7/8" bore (the one supplied with the SSBC swap was too big)
It ended up being a 73 Dart MC for MY application.
Note; mine is not aluminum...
Not sure if this helps you or not.
Doug