What masters cylinder to use for 73 dart disc brakes and 8.8 ford rear end disc brakes

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15/16 for manual brakes, and you will need a proportioning valve. Your dash should have a "brake-warning lamp." if it does, then use the Combination valve from any disc-brake A-body.
If you have 9" drums on the rear, I humbly recommend an upgrade to 10 inchers with the appropriate proportioning..
 
that's what i just installed and what i generally run on most of my manual brake cars
 

I purchased a set of 4 wheel discs from Aerospace Components for my car and they sold me a Mopar M. Cly. set up for the 4 wheel discs. You could give them a try.
 
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