Now I see , residue is in the throat. Not a big deal, just clean it up, I presumed it was on outside (ie leak). Clear lines are for vents and overflow , change them if you want to spruce it up a little , not criticle. Without you or us knowing your setup , it might need those carbs. What kind of pipes do you have? Clean the carbs out , not just throat. See how it runs , if it's not to your liking THEN start changing things.