I have a 65 with the factory intake and factory AFB. I filled mine, and would concour with Carbking that you definitely have to let the motor warm up (mine up to at least 160 deg coolant), warms up in about 5 minutes, but after that mine definitely runs better than not filled. I did switch to an electric choke. This is strictly speaking about spring - summer driving, with 10% ethanol fuel. Idle quality in hot weather is also much improved. It also helped a lot with the fuel evaporating out of the fuel bowls. I had another car with the same exact set up but cross over not filled, and the next day when you would go to start the car, the carb would be dry. I'll be building another motor for another car, and will do the same thing again.
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