Torque Converters for Internally Balanced vs Externally Balanced Small Blocks

Did Ma EVER put 904's behind 360's?

People like BM and others used to sell converter flex plates that were weighted so you could use a neutral converter behind a 360. Some of them had dual drillings for smaller converters.

ALSO MAKE CERTAIN the 904 is not an early one with the small converter snout, which will not pilot into later engines. I forget, 68? 69? and later. 67 / earlier were for certain small snout