Update: A good place to start for an idea of a conservative foreign policy would be this essay by Russell Kirk from 1957 titled The Essence of Conservatism. Here's the particularly relevant paragraph:
In the affairs of nations, the American conservative feels that his country ought to set an example to the world, but ought not to try to remake the world in its image. It is a law of politics, as well as of biology, that every living thing loves above all else—even above its own life—its distinct identity, which sets it off from all other things. The conservative does not aspire to domination of the world, nor does he relish the prospect of a world reduced to a single pattern of government and civilization.Amen to that.