I'm pretty sure the drop base flows enough with the three inch element and curved pan design. Airflow accelerates as it moves toward the horn. I have a fuel/air ratio gauge in my car, when I get a chance I will make a run with the lid on then another with the lid off and compare ratio. Or maybe do it in the garage. I have the same ratio now as was on the dyno, they have a monster air inlet so now congestion on theirs.
Which air filter are you running Bluebird? The round or triangle one in your pics? That would be interesting info to know about the fuel/air ratio. Thanks!