Adjusting the carbs

If you own a classic car with a carburetor, you will be interested in a Gunson Colortune kit (https://www.youtube.com/watch?v=Y9t8XhFlKbk&t=3s). This little device, a clear spark plug, helps you see the combustion in the cylinder and adjust the air-fuel mixture.

The Alfa's did not require much tuning, but we did find cylinder 3 was running too lean; and turning the  mixture screw had no effect. My hunch is the idle jet is clogged, but putting some miles on the car might clear the problem. 

Overall, the engine feels great - it revs easily and feels very powerful.