I just switched to a 1/2" phenolic spacer to use with my demon 650 / aircleaner assembly to clear the decklid. I have about a fingers worth of clearance at this point. I also have an edlebrock performer manifold. I am not currently using the screen cover. Not quite the answer you're looking for, just trying to help a little.
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.