POL Front Disks Conversion w/Tubular A Arms

I don't want to be a downer but I have to mention that I've seen reports of SOME of those tubular A arms breaking. I don't know the manufacturer, hopefully it's not the one you have there. That looks like a nice kit, sorry can't comment on your MC question. Good luck!

Oh boy!!! That's not good. I found this link from hot rod magazine that uses the similar kit from POL.

Do It! Mopar A-Body 11-Inch Disc Brakes for Under $400! - Hot Rod Network

Perofrmance online has the Master Cylinder as well looks like it has gone down in price.

1962-74 Mopar, Dodge, Chrysler, Plymouth Car Power Brake Booster Kit 19530