Google AI says the word SPECIAL cast on a 235 block means its a higher performance version of the engine. It doesn't give any evidence for that assertion, however. It just lists the possible performance enhancing traits the engine might have - Blue Flame, lifters, aluminum pistons, etc

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)