Merc 5.0 LX Plug questions
 

Need some advice. I have a 20' 89 Maxum with a Merc 5.0 LX, Alpha 1. Running AC-MR43T Plugs. I hear alot of people talking about different plugs and some running double platinums. I can't even find a cross reference for platinums. What I did find was Denso Iridium - IFT20 and Rapid Fire AC10. Don't think going with the Iridiums is a good idea but some info on what works, what to avoid and some part#'s would be greatly appreciated.