Chevrolet made 2124 SS427s for 1967. There is no breakdown as to how many coupes vs. convertibles.
The number of L36 427s is known, but as to the total number of 3-speeds, 4-speeds & Hydramatics within the L36 total is not known.

The L36 used in the SS427 had a different engine code, most likely due to the chrome valve covers on the complete engine assembly.