Sounds like a lot of fun, enjoy it. Just FYI the coils still work the same, you have to apply voltage to the primary charge them then when the voltage is turned off the coil collapse and the high voltage is caused by the coils field collapsing. That is what the timer does. Here is a nice diagram: https://www.fordmodelt.net/downloads/Ignition%20Wiring.pdf The modern cars art similar with a coil for each plug. Some use 1 coil for two spark plugs, each end of the coil secondary is used for a spark plug, That style fires on a dead cylinder and the active one at the same time.