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A couple of things...
Listen to Leonard: Don't Do It.
Unless of course, you just like to screw around, in which case , lemee tell ya how to make it into a dual system...
There's no reliability increase in switching to disks; if the system isn't well maintained, it will fail, regardless. In the process of changing all the brake lines on my wife's '57 444, I bent the long front to rear line to put it in the garbage can, and it snapped in half. Whew!!
ALL the lines, calipers, and cylinders are readily available and should be replaced or rebuilt.
If you want to get really fancy(recommended), John Farrell Auto Parts(800-454-7977) sells stainless pistons for 122/1800 caipers(they're the same from 6-1-64 to 8-1-68). Of course, these are E-Jag parts, but what the heck?
No 544 came from the factory with disk brakes, though I've seen stock backing plates with both 544 and 122/1800 bolt patterns.
Amazon and 544 rear brakes are the same; many Amazons came with IDENTICAL Wagner brakes; you certainly don't want Girlings.
There are 2(or more) interchangeable cylinders for the Wagner rear brakes; 7/8", and 3/4" bore; smaller is better in conjunction with front disks. My first 544 came with one 3/4 and one 7/8 on the rear. Try to figure THAT one out.
Use a Wilwood or Ford SVO adjustable proportioning valve from your local speed shop, Summit Racing, Jeg's or the Ford dealer. The 122/1800 ones are pretty wasted by now and aren't worth rebuilding unless you're a purist.
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