Resto,
I read somewhere that if you find a solid (square) metal bar and lay it across the hood's recess area on the fenders (inboard of fenders towards the engine bay) you can get an accurate drop measurement to either the air cleaner (if you plan to keep it) or to the original manifold carb base. Then determine if you have the right clearance through the math.
I installed a single plane X-CELerator manifold, and I'll have no problems (I ordered a 2.5 inch Weiand air cleaner).
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GerryLP 
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