No DO NOT touch the carb..get a 1 inch aluminum spacer plate..GO WITH 2 INCH if you got hood clearance ..some come with a vaccum port but you can drill and tap one no problem..tap it and run you a 3 way if you need more than one vaccum port.
( make sure you get the plate for the 4500 series dominater)
Brian
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "