Originally Posted by
36 sedan
JMHO, but appears you have two problems;
1). There may not be enough initial timing on the motor.
2). Appears the carburetor is suppling too much fuel to the idle circuits.
I would give it a little more timing (turn distributor counterclockwise), and try starting it with just a 1/4 throttle. The carb may be too rich to start with a closed throttle, opening the throttle a 1/4 may be enough to get it off the idle circuit but not enough to be too lean when it's cold.
If that starts it, I would check the idle air bleeds in the metering blocks, occasionally a carb gets set wrong from the factory or may have something in the air bleeds (packing material). It could also have been modified by someone and sent back, then sent to you as new. Check it to be sure, if everything is clear and looks good and the air bleeds are the correct numbers, I would then contact the carburetor's manufacturer for further advice.