One coil feeds to cylinders #1 & #4, the other coil feeds to cylinders #2 & to #3. It may well be that one pair of coils has a blue colour wire (from the points) as well as the black/white wire & the other coil has a yellow wire (from the points) & the black/white wire. The coils for #2 & 3 may well have the shorter leads to the plug caps & the coil with the longer leads are for #1 & 4.