The way i used to set these up i presume the mixture adjustment is @the bottom of the float chamber and not through the damper top using a special tool. either way the first thing to do is replace the diaphrams then set the jet heights if from underside models get them level with the top of the jet holder then lower the jets about 1 and half turns if the adjustment is on the needle in the suction chamber its the same procedure for the needles from the pistons get the needles lower from the lower face of the pistons then get engine hot and adjust the mixture on the carbs by the same amounts lower the jets or higher the needles whatever model of carbs you have to richen or other way to weaken you can test by lifting the piston in the vac chamber slightly if to weak the engine will slow to rich it will speed up. the ideal is very little change on all carbs. make sur the ignition timing is correct before you start
SOURCE: I have a '69 E
Your problem is more likely a distributor-timing problem, than a carburator problem. The richness of the fuel acts like a constant choke, and the car runs fine until it warms up.
Once the car is warm, try manually advancing the spark. If that helps, then take the distributor to a repair shop that can tell you if the vacuum advance is working properly.
Remember, the spark must be +10 degrees advanced when cold.
Good Luck
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