If you do your own work on your stovebolt engines, it is easy to know which wire goes on which post, when the connection side is orientated downward (as GM sent them out of the assembly plant): install the coil with the ignition-lead connection-post towards the firewall, and with the distributor-lead connection-post towards the front of the engine? follow that logical habit and correct-side down is relatively easy to deal with.
Trivia question: on which GM straight six trucks (let's say 47-55) was the coil mounted with neither side up nor down?
