Shoot - I wish that guy I met recently would post on this thread! He's got a NICE ram air setup...
He removed the high beam headlight assembly from the grill, and ram two very large (3"?) tubes from the open headlight area stright to the dual snorkle air filter. B/c of the location of the intake - you're certainly getting air flow, if not too much of it! You still get the Firebird look of having 4 headlights, b/c the holes left behind are round - but you lose your high beams.
I'll see if I can get pics from the guy, or get him to post a reply here about his setup. I was impressed.
'68 Firebird, 350-4, 2 spd auto, triple black, Dlx Interior