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This is a bit of a trick question...
These cars never had 4 wheel disc brakes originally, so there are a couple of "correct" proportioning valves...

1) A plain distribution block from a 4 wheel DRUM car. The proportioning valve is used mainly to compensate for the different pressure and volume requirements of discs and drums. Strictly speaking it is not necessary when front and rear are the same brake type.

2) Same as 1 with an aftermarket adjustable proportioning valve plumbed in line with the rear brakes to fine tune the bias.

3) A combination valve (with metering) from a 4 wheel disc brake car with similar weight characteristics as your car

4) An aftermarket combination valve for 4 wheel disc setups, preferably with adjustable bias.

Good luck,
Rory
 

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I just installed one off an 86 Mustang SVO on my 69 and it works fine. The Mustang SVO cars came from the factory with 4 wheel disc brakes.
 
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