Engine is a 292, MSD distributor with 34 degrees total all in at 3,000 rpm with about 8-10 degrees initial.
Carb is an Edelbrock 500.  The truck runs very well, and behaves flawlessly until WOT when it knocks badly. (92 octane fuel).
What do you guys think of this plug?  Should I try a richer secondary jet?  If I back the initial timing down it just isn't as responsive around town.