Where did you find that relic? The Smithsonian? I should talk. Back when tailpipe sniffers were part of the State inspection, I bought an exhaust analyzer from a co-worker. By the time I got it calibrated and working, the State had moved on to OBD2. Story of my life.
I always stuck with Mallory ignition parts, or Blue Streak. Accel was what the speed shops pushed but they used to crap out unexpectedly. If you can't find a stock coil, I am sure you can get a high output version, same size, and just paint it black to look stock. I have a big coffee can full of the old spark plugs for our Firebirds. I knew someday it would be hard to find them. I don't know if they make an Iridium version of ours. If they did I would use those. I have Iridium in all my other cars and they last forever.