Worth it? Absolutely!

Can you feel it? Probably not.

If we had about 7 more cylinders then it might gain 2 or 3 hp. It MIGHT be more responsive but not any faster. It doesn't cost anything more when changing your plug and you'll only spend an extra 2 minutes doing it, so why not?

To each their own. I was just providing info for anyone who wants to experiment.  

Kris which intake valve are you going to point the gap at?I believe either would be wrong,for our motor.but I think I'll let you guess why.

Kris, if  were to do it I would point the gap to the left side of the motor at 90 degrees to the valves,for two reasons,one; the plug is at an angle and sets in an uneven pocket in the head .keeping the neg. electrode in the deepest side ,keeps it from blocking the fuel/air mix across the chamber. second,this also exposes the spark to both sides of the chamber evenly,and the two major squish zones are between both sets of valves heating and pushing the fuel mix toward the plug as the piston reaches TDC.

Anybody got a pic of our combustion chamber?

Kris ,it's funny the plug in the pic is nearly in the position I described earlier,about another 1/8 of a turn would have been perfect.You can see that the threaded base of the plug protrudes slightly at the top,but you can see about 2 1/2 threads showing just to the right of the neg. electrod.You can also see the squish zones at 3and9 o clock.

The spark plug doesn't ignite the mixture as it enters the combustion chamber. Remember, INTAKE happens on a downward motion of the piston. Before the piston reaches BDC the valves are closed. As the piston rises and compression of the mixture commences, there is tremendous swirl within the combustion chamber. By the time ignition occurs the mixture is distributed evenly in the chamber.

Sparkplug indexing is total BS!

WOW! I've been drinking the Kool-Aid all these years! You're correct! The plug doesn't do anything while the intake valve is open. I've never actually considered what happens during the actual combustion process. The ground strap wouldn't block anything!

I guess the idea is to not allow the ground strap to block the flame front. By turning the ground to a favorable position MIGHT be beneficial in some combustion chamber designs, but not ours.