I use Tri-Y headers on my '66. It has 2 1/2" collectors and I just buy Ultra Seal gaskets by Mr. Gasket at AutoZone for about $3 a set. See if that doesn't work.
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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