To ID the rotation of a vacuum advance distributor, look down onto the top of the distributor with the vacuum advance pointing twords forward. The vacuum advance will be offset, either to the left or right of center of the distributor. If the vacuum advance is on the left side from center, the distribotor turns clockwise (right), and vice versa for the other side.
Cadillac, Buick, Chevrolet turn clockwise (right), Oldsmoblie, Pontiac turn counter-clockwise (left).
Ford counter-clockwise (left)
AMC clockwise (right)
Mopar
Small block clockwise (right)
Big block B-RB counter-clockwise (left)
You didn't specify an engine, so I put 'em all in.
Hope this helps.