Help me out. This may look like a stupid question but, here goes. How do you distinguish which port is which on a master cylinder ( front and rear)? I got a #mc39027 master cylinder (1976 to 1980 Chevy Monza m/c) to go under my 34 Ford. I need to go to a 7/8 bore master cylinder to achieve better braking. And I don't want to plumb it wrong.