Spark Plug recommendation; blown 360

Bob, Thanks a lot for the reply.

I have heard that you don't want to put an extended tip plug in an engine that's going to see boost, because the extended ground-electrode will turn cherry red and act like a glow-plug under periods of boost longer than a few econds. I don't have any idea if that's true, but this NGK plug you recommended looks like an extended tip plug in the pictures, to me.

Have you used this particular type of plug in a blown engine, and will it screw into a Magnum head? I'm not sure if the Magnum heads take the same plug as L-A heads, size-wise and thread-kength-wise.

Thats much for any information!!!