304?
With a 304CID, I'm just guessing that he has a 600CFM vac secondary 4160. Probably the 1850 that was mentioned. Mine had #66 primaries and I think #66 secondary plate orifices. Check the primary jets that are there (10 minutes procedure). I'll bet the secondaries are the same #.
Rev
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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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