Edelbrock part throttle surge help

Still have the problem... I increased the cruise mixture to the next level from stock keeping everything else the same. It helped a little but i still have a part throttle surge. There is no reason i would need to bump up the mixture more - the motor is near stock! The *only* other thing i can think of is that i'm using the Eddy sp2p emissions 4bbl intake which has small ports - does anyone think that this could be my problem?

I have a spare holley 600 laying around that i rebuilt; i'll throw it one to see if the problem persists and keep you posted if anyone cares. If the problem persists, i may upgrade to a eddy performer intake.

Thanks for any other suggestions guys!