Definitely have to get a fuel pressure regulator, the Weber likes to only have 1.5 to 2lbs of pressure. Put that on and got rid of the dieseling and my mileage increased. It always ran rich til I put that on. Also take it apart and lower the float 1-2mm below what they call for will help on hills. They have a funny habit of dying on hills without some massaging. There is also a modification to vent the float bowl differently than stock that help if you get on steep hills and rough, bouncy terrain. Don't know if it would of been an improvement over a brand new stock carb back in the day, but these carbs now have 20+ years on them and things internally are wearing.