My understanding is that a proportioning valve is necessary only whe you have front disks and rear drums. This allpws you to adjust line pressure biased towards the the front disks. That keeps the rears from locking up on a hard stop. With all drums or all disks, I don't think you should need one.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.1 mph
1/4 mi.
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