Yes, in 1966, they added an additional character to differentiate which carburetor was used:
"H" - Holley
"R" - Rochestor
Denis
1967 Impala SS Sport Coupe 396/TH400/12 bolt. Marina Blue (South Gate built)
1967 Impala SS Convertible 327/TH400/12 bolt. Ermine White (St. Louis built)
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on 7/3/2017, 10:30 am, in reply to "