Coil polarity question

[Iampappabear]

I have been given (2) 12A366 ignition coils to rub my Farm Boy hit & miss engine. These coils are exactly like the one shown in the link below. Is the polarity of the coil critical and if so, how do I tell which terminal is positive.

It's about -8 Celcius here in southern Ontario with an unheated shop, have to work on indoor things only.

Thanks in advance

Colin

Motorcraft DG508 Ignition Coil, Coils - Amazon Canada