Tom, perhaps the simplest method for drawing air from above a carb is to use one of the several porous tops sold for std round 14" OD air filters. Most are cleanable.
No one has tested but I suspect that most if not all the air drawn in by the engine will go through the porous top, making the 'std' air cleaner element below it only along for the ride and requiring rather frequent cleaning of the top filter.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.