.. spark plug recommendation ? ..

I've been running Champs for the last 3 1/2 decades and have no issues with them. I did at one time switch to Autolites but the quick acceleration, IMO, was not there so back to the Champs and have been there ever since. 340 .030 MSD ingition, Mopar 509 Purple cam, 3500 stall, and Champs do there JOB..