4 wheel disc master cylinder?

pauly v.100 said

if they say you might need an adjustable prop valve then why use the stock prop valve turned distribution block at all.
just run a brake line from the MC to a T fitting for the front lines and run the rear line straight to an adjustable valve and sell the original prop valve to somebody who needs it. its a much cleaner arrangement and adjustable prop valves are pretty cheap from Summit.

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That is also in the instructions as an alternative?!?! I'll try and scan them and see if I can attach.

That gives me something else to think about. I still have the original distribution block. I was not looking forward to mounting the proportioning valve/distribution block and all the lines to the frame rail, next to the ill fitting header while lying on my back in a cold barn!!!!