The engine in my ECTA car/record holder makes use of a coil-on-plug system. The coils are about the size of my thumb and are a known failure point. I switched to Accel coils and they worked well for me, but I long-ago decided to, from now on, use a coil-near-plug system. Ideally I'll make use of nothing more than six inches of plug wire.
Complete control of the ignition will be built into the EEC system. I was actually thinking of the coils themselves when I made my comment above.
I've found, at each project I've ever been involved in, that connecting to someone who actually has the answers at a manufacturing concern is critical to a 'happy' result. (As a kid, I used to be able to go over to Mallory in Detroit, and go in the side door. They ALWAYS treated me well. I've followed the same sort of activity all my car-connected life.)
KS