7 1/4 Rear End

72 would be 5 on 4 unless changed for later year gears are probably can't hardly get this to move but when it does get up to cruising speed you can hardly hear the motor
Yes unfortunately I know that. I’ve got one on my 65 dart and I’d love to have a 323 positive track but can’t find one without cutting my tail shaft it’s brand new so I guess I’m stuck.