Tony,
I made mine out of a oval aircleaner off of a mid 80's Ford Escort.
You can see a picture of it here,
http://www.geocities.com/mustang_man_1966/inline_6_carburation.html It's the dual carb setup about halfway down the page. The top was aluminum so I just stripped the paint off it and gave it a good polish and the bottom I cut off and riveted a new piece of aluminum sheet to it.
Then I just cut the 2 carb hole openings and attached the dual snorkels to it.
Worked for me and was dirt cheap!!
Later,
Doug
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66Coupe 200ci
"Six Packer Performance Freak"