What confuses me about that system is that the hose on top the air cleaner seems like the carb would suck air from the valve cover rather than the other way around.

In other word it looks like crankcase air would be drawn from both hoses with no fresh replacement air.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)