Clearly you bought the wrong carb repair kit. If the parts won't fit, then they are NOT for your carburetor. Can you go back to the bastard who sold it to you and get the RIGHT one?
In my experience, generally when a vehicle tends to show slightly increased fuel consumption, the 1st thing we check is the Ignition system, spark plugs and gap, timing and dwell, contact points (if yours is not yet electronic ignition) etc.
Next we check the valve adjustment and then change the oil.
Only then do we check the fuel system. Start by replacing your fuel filter.
To set the carburetor correctly the 1st thing is to ascertain the FLOAT Level. If that is correct replace the gaskets and seals. If the engine is burning correctly don't bother to replace the jets. Just clean the carb out with compressed air.