Does anybody run this plug? Will my stock '77 like it?

Works fine

Thank you and what a great looking car you have.

I am running ZFR6F-11 in my 240. They are extended tip, and the Z loves them.

If your car is running clean plugs but you worry about detonation due to higher ambiant temperature, turbo boost or higher compression, you can try a colder plug (ZFR7F). Just make sure it does not foul up due to black deposits.