Need engine misfiring advice Options

[oakdalecurtis]

Here’s a question for the braintrust.
I have a 1974 stock FI original motor, 130,000 miles. It has a Crane Fireball ignition and Novolny plug wires. It has always run flawlessly from startup. Lately, upon cold start, it has been badly and randomly “missing” for the first 2 minutes, especially on acceleration. It is not a constant steady miss on one cylinder. I can’t say that is isn’t one cyclinder doing the missfiring, but the miss is random, 2 seconds, 4 seconds, 3 seconds apart. Then it runs flawlessly after the first 2 minutes.. The AAR valve works fine. The MAPS board has been replaced with a new one a while back. I have checked that all the plug and coil wires are tight. I thought maybe some long term water concensation in the gas tank might settle and cause an issue. I added a fuel additive to prevent that, made no difference.
What do these clues indicate on where to start looking for the this inital start random misfiriing?