Thanks Dave and Sniper... those are good ideas.

I'll have to get the rest of it put together and determine the fitment for how tall the sealing material will have to be. I'm just planning to have a flat sheet about 2'x3' that will be at the height of the carb inlet.

Some I've seen at the track use some kind of foam like what you would find inside a seat cushion or packing material about two inches thick and stacked up 3-6" or so to get fit to bottom of hood. I'll see what I can find at Lowe's after I figure out how tall it needs to be.

-Chris