[scicala]

The carb wit the vacuum secondaries does not have the throttle lever like '56 Mercury or '57 Lincoln used. Best gues is mid 50's Chrysler hemi.
The carb with no choke does not have a Chevy style throttle lever, so I woud say maybe a secondary carb for Cadillac or a '57 392 Chrysler hemi. Both of thos cars also offered two four barrels in the 50's.
the casting numbers don't really help solve it unless an expert on them.
There was never a 2x4 setup that used both a mechanical secondary and a vacuum secondary carb is the same set.

Sal