Spark plug dilemma (efi+N20)

Gentlemen,
Re spark plugs. If the engine is of the LA family, it uses 3/4" reach spark plugs. Therefore, the AC R42 or R43 are incorrect as they are 3/8" reach plugs. For a LA engine a NON projected nose plug would be AC 43XL OR 42XL. For Champion N3 or N4 or something that has a slightly hotter heat range could be considered. You are not dumping the 150 HP nitrous load continuously, only on "special occasions", you could probably use Champion N-10Y (projected nose plug) as the incoming fuel charge will cool the plug yet the plug will be hot enough to keep itself clean furing non nitrous operation. Fuel mixture and spark advance are other factors that must be addressed. The NGK, AUTOLITE, E3, etc. proponents will have their own preferences and opinions.
Bob Renton