I have happens ever time i start the motor,i pump the gas to get the motor started, it run afew sec. then dies but as its dies it pops gas threw the carb. some time if i pump it alot it will shoot a flame, this only happens when its a cold start, so i pump the gas ride it lightly and increase the rpms and gas as it warms up and it ok
once i warm it up i don't have to give it gas it fires right up with no gas? is this a timing thing
the motor has a holley 850 stock out of the box 454, 1.190 1.880 781 heads and a lunati cam
duration @.050 232/239 deg .549/.558 lift @ .050
HEI with a 50.000 summit coil

If your not using the choke, engine is running lean until it warms up,choke helps to supply more fuel than air,common problem on cars with no choke and a cold engine.Shouldn't be as bad when the weather stays warm! graemlins/waving.gif

It's running too lean, either because of the timing, or the jet sizes, or both. Retard the timing a few degrees, and you should hear your idle increase in RPM - and that means it wants to be richer. I once burned off my hair from this same problem when the carb puked fire. graemlins/clonk.gif

Good luck,
Keith