I see a real clean 67 GTO at cruise night last night. Had a 6.0 with a Magnuson super charger, 4 spd. It was a pretty nice fit, smooth idle, fairly quiet. Said he was getting 19, to 20 MPG as long as he drove it nice. When he mashed the skinny pedal leaving in came to life, sound wicked, pretty sure that car hauls the mail quite well!