1971 Duster 340 4speed rear end gearing?

Getting ready to send out the rear end to get freshened up. When I told the guy thats going the work for me that in its former life the Duster was used for Drag racing and that my goal is to get back to more an original state. He asked me which gearing I would want for the rear end. My question is what would normally a 1971, 340 4speed Duster come with regarding the rear end gearing.

Keep in mind my intentions is to restore and make a nice street car.