Before you rebuild your carburetor, thoroughly check everything down stream. Attached are horror story examples of what I ran into. I replaced it all. I feel that most of this rust damage was due to Ethanol. Gasoline filters are good for trapping the occasional particles from a gas station pump. Don't waste a lot of time, money and effort on a carburetor if you plan to feed it dirty fuel.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
