That protrusion on the front of the snout of the casting is not something the original Bendix cylinders had. It is probably an EIS or a Wagner. My old work's master cylinders had a conical area cast in that area for fixturing when the casting was being machined.
Bendix was always flat in that area, they apparently fixtured them differently for machining than the aftermarket companies do.
I couldn't tell for sure from the pictures if the pistons have the groove for manual pushrod retention. If you look inside the hole closely it should be apparent. Here is a diagram showing how the pushrod is retained. Mopars use a hard rubber ring for a retainer.