Moe, There's some good advice above on how to figure this out.
What may help you sift it out is that the carb is NOT coming off the idle circuit when the throttle is cracked open. The off-idle gets more fuel from the transfer ports or slots, but is also fed by the idle circuit.

This is why people have posted questions about idle-mix screw sensitivity, timing and throttle position.
Chrysler Tech has a decent explanation Carburetion Fundamentals and Facts, 1970 MTSC, p7
Full index Master Technicians Service Conference

The idle system responds relatively slowly to changes in manifold pressure. If it stumbles when the throttle is gently opened, then its not likely to be solved with more pump shot. If it only stumbles when the throttle is applied quickly, then its pump shot.

A smaller throttle and venturi (ie a 650) will be easier to tune the idle system. All things being equal, manifold pressure will be higher and main systems will start earlier. It may give up power at the top (quarter mile) depending on displacement and rpm.