Clean out the tank!! My 65 step had been stored for 22 years and while driveing it north (300 miles) it started running rough. Took the top off the carb and was amazed at the crap inside. I have since rebuilt the carb and will clean the tank out after I get it home. I plan on keeping the 6 in place adding split manifolds with dual exhaust and not sure where I will go with the carb. I like the look of dual carbs but hear a 4 barrel 390 cfm carb on Clifford manifold works really good.