If you read Buckley you would realize that he is indeed a social conservative.That depends on what you read. Make a movie out of one of the Blackford Oakes books and Donald Wildmon won't know whether to run for the megaphone or the commode. He's also come out in favor of legalizing pot.
The two greatest political conservatives of the postwar era were Goldwater and Reagan. Neither was a "social conservative" per se. Abortion doesn't count as it transcends conservatism itself, let alone "social conservatism". My former Congresscritter, Mary Rose Oakar, is as objectionable a liberal as ever ran for office. But she's pro-life.
-Eric