Possible Clues:

• Pontiac in a '60s hit song
• Car modified into the Monkeemobile
• Old Pontiac with a V8 engine
• Trailblazer in the muscle car category
• Pontiac in a 1964 song
• Muscle car in a '60s hit
• It had 'three deuces and a four-speed and a 389,' in song
• Old 'Vette rival
• Early Pontiac muscle car
• Classic performance car