For 1966 A-body production, 3,047 326HO man trans (WR code) engines were assembled; 2,206 YP-code auto trans HOs were made. Not all of these engine assemblies were installed into cars, so this is not an official final production count, but it is very close. Since convertibles ususally constituted around 10% of the production total, it would be reasonable to guess that around 500 converts received 326HOs in '66.
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