Not sure what you are asking. I just swapped master cylinders on my 70 Stage 1 when I went to 4 wheel discs. On my 71 350 4spd I swapped from front drum to disc with just changing the rubber hose mount and everything between the spindles. All the hard lines were the same.
The proportion valve is attached to master cylinder. So lines are different from stock. Got lines from inline tube . no diagram. Called them they say they don't have any. They suck! Line going from size to side across the cross member isnt even close. They are no help.
The factory service manual and assembly manual have basic illustrations of the line routing. However, the lines are somewhat different depending on what brake system was installed at the factory, i.e. manual drum vs. power drum or power disc, etc. The '70 power disc/drum is the most common style of upgrade and is interchangeable between almost all (there are few exception) a the GM A-body cars from '68-'72. I would be leery of an upgrade disc brake kit that didn't come complete with lines, proportioning valve, master cylinder, booster, brake pedal, calipers, spindles, backing plates, hardware and the lines necessary to convert one style of braking system to another. And a complete set of instructions. I hope you have purchased the correct kit for your application.
All I did was replaced aluminum drums with stock spindles an rotors etc fro a diner 72 g/s. But when I added rear disc I purchased disc disc Corvette style whit prop valve up top to clear my breather and give more room on firewall. I got it figured out line come all the way across from passenger side up to prop valve on master. I was just confused.:dollar: New territory for me.
