MSD wish sparkplugs?

I have had good luck with NGK Racing plugs. I raced all last season and only had to change my plugs once.

The NGK I use is #7173, it has the thread length and projected nose like the standard 340 plug but has a 5/8" hex instead of the 13/16" hex. For my application the smaller socket makes it easier to change plugs because I have header plates on my heads.

If I remember correctly this plug is 4 heat ranges colder than the standard 340 plug.