I hold to the view that the original carb is suitable only for geriatric driving ( ONLY JOKING! )

The best fix is to replace it with a 32/36 Weber and then put the car on the Chassis Dyno and tune the carb to suit.

With luck you will be able to minimise the idle emissions down to California requirements.

If you can, then the car will have better performance than standard and the Law will still love you.