Coil Mounting-Vertical-Horizontal?

I never knew what original coils were, oil or epoxy filled. I would assume old cars like ours were oil filled. I recently had trouble with an oil filled that was horizontal. I replaced it with an epoxy filled coil. The only Mopar that I know of that was vertical was my 58 Fury 350 engine with 2 four barrels because there was no room to place it horizontally. Probably other multiple carb engines had to place them vertical.