So as work continues on my truck my father brought to my attention that the spark plugs I am using are too cold for my setup. I'm running a twin Mikuni 2.6L and it backfires like crazy and my current plugs foul up quickly. I know that the carbs are running a little on the richer side, but he told me he used to run some hot plugs that had a green ceramic and had a tip similar to a splitfire plug. I am currently running some standard Champion RN12YC plugs with an accel super coil. Any suggestions (besides leaning out the carbs, that's on the list)?