Mild 318 misses at 3000rpm

I see everything is fresh. I was hoping that you just switched distributors and that's when the problem started. Without a scope to see the ignition pattern, it's just a "check this and replace" that kind of repair. You could throw in a known good distributor with a ballast resistor and see if it's definitely ignition. I chased a bad idle on my newly rebuilt 273 for 2 years before I found the Autolite plugs were too cold. You'll figure it out. Just a matter of time.