I switched from Champion N9YC to NGK BP6ES on my fairly stout 360 and there was a substantial improvement. I'm also running an MSD 6AL and IIRC MSD specifically recommends AGAINST running platinum plugs. I'm not sure if that is true with any other aftermarket ignition systems.
Some see the glass as half empty, some see the glass as half full. I just drink straight out of the bottle.
