Fit elctronic ignition with LPG. For years i fought against it. The only idiot for not doing it, was me! Ordinary plugs is fine - why platinum sparks? If you must, i suppose, but not needed, if you have good ignition. Simon BBC did min new dizzy and electronic coil. From freezing it'll start form LPG which it never di before. Do it. I have the ACR kit too. Another worthwhile if pricey mod.