I think most of the members use NGK BP7ES. The old non-resistor Champions N7YC is what I had in my P11 when I used the K2F with Accel copper core (or stainless core) wire and standard Red rubber automotive caps. Didn't have the internet back then to tell me I was doing everything wrong. lol
Forgot to mention that Accel plug wire was Yellow. Had to be Yellow back then. Way faster with Yellow plug wires.