Which Master Cylinder is correct ?

[68 COPO II]

Does anyone have reference material to identify the application for master cylinders 5460465 and 5460346? I am restoring the front brakes from disc back to the original drums and don't know which master cylinder is correct. The car is a 1968 COPO Nova SS big block, if that helps any.
Thanks,
Dennis

[Stefano]

Dennis,
My 1968 Z28 and 1967 400 Firebird have master cly part number 5460346 with WT stamped on the front machined pad. Both cars were factory equiped with 4 piston power disc brakes.
I do not think this master cly would be correct on a drum brake/ no proportion valve car.

[Stefano]

Dennis,
I do have a complete drum brake set up if you are interested. Spindles to Dust Cap, no hard lines. Was all NOS 2,000 miles ago.
I'll take your Disk Brake set up on trade.

[68 COPO II]

Stefano
Thanks....you have mail.