I would not use a Corvette MC for this application. As 3B stated you may be able use the stock dual MC as it has built in residual valves. Check your local parts store to see if the MC is different for non PB vs factory PB. If it is use the stock MC that is used with a booster. In most cases a proportioning valve is not required with drum brakes.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine