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Remove the welch plug from the oem carb. When adjusting the air/fuel idle mixture screw** when you turn clockwise you decrease the setting (air input in this carb's design) so the fuel mixture to the motor richens up. Doing this will reduce the amount of time on idle you need to hold the choke before you can release it. If you go the opposite direction you add more air and lean out the setting so it will take more time holding in choke before the engine likes running on its own. Also adjust the valves properly.
** assumption is that an owner knows how to properly set the screw to start with. You will have about 1/2 a turn of optimum position in either direction before it will start to induce a bit of lug. Instead of keeping it in the center of that optimum zone, go in closer to the rich edge to reduce the choke time on cold starts.
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