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Wow, that is confusing. Hope someone chimes in later that can answer you question, Id like to know also.

Adam; I know this doesnt answer your question 100% , but in the Autolite line, 65 is the plug listed for a 340. I use them in my 360 PU and the 74 Duster, but they sure arent 11:1 engines.

About 17 degrees initial and total of 34 should get you close, you can fine tune from there to meet your particular engine needs