I helped my friend put a duel master cylinder into his '52 3100. It was for a '70 or so Impala (drum/drum). The ones for the Corvette cost more money. The Impala master cylinder is a 1 1/8" inch bore same as the stock '52 master cylinder. The Impala master cylinder has a 1/4" and 3/16" ports. The 1/4" port will be used for the front brakes. The Impala master cylinder, as you are looking from the peddle end the ports are on the left, 1/4" port is nearest to the peddle and 3/16" port is farthest from the peddle end. We did not boost the brakes and we built our own bracket.

Woodildo