Disc brakes

[joesauer]

Not sure if you are trying to keep the car original (your addition of disc brakes).  Most aftermarket brake manufacturers (SSBC,Wilwood, etc.) make adjustable proportioning valves.   After installing, you can dial in the front vs rear braking characteristics you want. 

[Sauron327]

Not sure if you are trying to keep the car original (your addition of disc brakes).  Most aftermarket brake manufacturers (SSBC,Wilwood, etc.) make adjustable proportioning valves.   After installing, you can dial in the front vs rear braking characteristics you want. 

Or just use a combination valve that was introduced in 1970. All the vendors sell combo valves but they don't look like a GM valve.

[Sauron327]

OK, my bad.  Serves me right for relying on memory  

But OP still need the metering valve for front disc/rear drums, right?

Not according to David Pozzi unless you are driving on snow and ice. Anybody here doing that?

[David K]

When I lived in Northern Virginia and my 68 was my daily driver….yea.