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After 15 or 20 seconds of cranking with the choke completely closed (and the engine not starting), there should be raw fuel puddled in the bottom of the air intake of the carburetor in both early and late model engines. The fact that your engine runs normally after it warms up also confirms that the problem is limited to the choke. Unfortunately, I'm not able to determine from your report what may be preventing normal choking.
The additional length of your scavenge tube shouldn't have any bearing on your ability to choke the engine, unless it is somehow disconnected below the carburetor. In this case, air would be sucked in through the bottom opening and prevent normal choke function.
You might try removing the flame arrestor housing and holding your hand over the intake of the carburetor while someone cranks the engine over. If you don't immediately see large amounts of fuel collecting in the bottom of your intake throat, there is an air leak somewhere downstream of the choke valve.
Don
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