Holley Cold Start - Run Issues.

Been fighting this one for a few months now and with spring on the way,
it would be nice to get figured out.

It's a Holley street avenger 690 CFM. It has to be specific to this carb
because the 3310 that was on the car never had the same issues.

Starts right up cold or hot. Choke's set right. Floats set right.

After a cold start, it will for about 5 minutes then want to die like
it's getting no fuel, I have to pump the hell out of it and keep it revved
at 2k to keep it running. Even then sometimes I have to feather the
pedal to keep it running. I've tried changing the choke settings but it
doesn't make a difference at all. I figure it must be something with the
carb starting to get warm or the differential between the engine and
carb. It's on a edelbrock performer RPM manifold. Like I mentioned the
other holley which was a 3310 had zero problems, and it runs awesome
once it's all nice an warm....