'64 Barracuda Master Cylinder.

Need some advise please.

Specs., 1964 Barracuda.......273 V8........manual brakes, stock.

Replaced the master cylinder with stock manual brake master. This leaked, between the master and the firewall. (Did a nice job on the fresh paint too, but......

Replaced it again. leaked the same way again. What am I obviously missing?

Just don't get it..........

Poor quality of master cylinder? Have you converted the car to a dual chamber master cylinder? They are much safer than the old single cup master cylinders are.