Brian,
I believe that the '66 327, 275 hp combination is relatively unique in that you have a choice of three carburetor manufacturers. Sub-note #8 on the tech page indicates the availability of:
Alt carbs - Cart AVS-4027S/SM 4028S/PG Roch 4MV-7026203/SM 7026202/PG
It is my recollection that the overwhelming majority of Stock and S/S cars running this combination use the Quadrajet. Having said that, you clearly have the option to use either the Rochester, the Holley, or the Carter.
c
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Chuck Norton
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