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For fouling in 30 miles I suspect you may only get marginal improvement with the W18s.
Try the w18s, if issue not resolved as FM indicates most likely your carb is running way too rich. Try cleaning the carb, clean the passages/jets, can replace Jets using Renners Corner Jet kit (they come flow tested). Or if you have or can borrow a known good carb. swap in a different carb.