I need to replace the sparkplugs on my '90 SHO. Now that the OEM plug has been discontinued, what is the sparkplug of choice for the SHO's? The SHOtimes FAQ lists a Denso p/n PK16PR-L11. Is this a reasonable alternative to the OEM plug? What is my best bet? Thanks. Frank Fowlkes '90 SHO w/some mods El Paso, Texas