[arntztype4]

Bluedog,

I have a 427 with a Demon 750 CFM, with no choke horn also. I do keep the Cobra in the garage. Every time I go to start it, I pump it one time, it turns over about 5 to 6 revolutions, and starts right up! For some reason, it is not cold blooded. I have had FE's in the past that acted like yours.
By the time I drive about 100 feet down the driveway, it's idling fine at about 1,000 RPM's.
I think it's all in the fine tuning of the carb. Even if the fuel line bleeds down a little, there's enough fuel in the carb to start, and run for a minute or two.
Good luck!