All big block intakes are of a air gap design.
An interesting choice IMO. It'll provide the sound and power range your looking for; http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=717&sb=1 2-6 grand rpm
It's a split duration to help the heads/engine breath better.
Or this one designed to idle ruffly; http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=1497&sb=1 2200 - 6100 rpm.
(Not a fan of the thumper series myself. It's centerline and intake opening points are moved downwards to chop heavy. It's a few hundred RPM's higher in the power band. The exhaust valve is held open longer.)