Thanks. Yes I'm aware that it's a projected tip. There is no clearance problem. I thought Nate asked which plug do I use. My personal preference at the moment is for the BP style plug in my '70s 3800s. But, I recommend using an NGK B5HS or one of the equivalents that I listed, for his 3800, while I'm still experimenting with the BP style plugs. I apologize for any confusion that I caused and hope this clears it up.