I will disagree with Joe H on the oil. If the engine hasn't been rebuilt, I'd recommend 20w-50 or 15w-40 Rotella T4.

The heavier weight oil is needed to fill the large clearances between moving parts and to keep the oil pressure up. Thin oil on a worn out 70 year old engine is asking for trouble.

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)