Possible Clues:

• 'Yeah, yeah, little ___' (repeated line in a 1964 hit)
• Muscle car in a 1964 hit
• Letters after 'Yeah, yeah, little ...,' in a 1964 hit
• Pioneering muscle car
• Car for which you 'Listen to her tachin' up now, listen to her whine,' in a 1964 hit
• Hot car monogram
• '60s song car with 'three deuces and a four-speed and a 389'
• Muscular Pontiac
• Automotive debut of 1964
• Car that's 'really lookin' fine,' in song