 A performance "S-55" package included a big-block 300-bhp 390 V8 and a sporty interior that was similar to the Ford Galaxie 500/XL.Monterey became the entry-level full-size Mercury again for 1964, with the return of the Montclair and Park Lane.Grilles and taillights were restyled and toned down a bit, making this model especially attractive, a big car but not bulky-looking.