If you have a '58 or later distributor, why not install a mid to later 70's electronic Ford pickup coil into your distributor and let it fire a gm hei module, then you can run a later Ford E coil. I have converted many Fords, flatheads and later this way, it makes for a clean fool proof ignition system and parts are available most anywhere.
Another alternative would be to use your existing points to control a gm hei module, would work like the capacitive discharge systems that were on the market 40 years ago, the points last forever because the voltage is much lower. You can find wiring diagrams to do either on google