gas mileage

Dave I bought a 98 Dakota in 01 and in 09 i bought a 09 2500HD Chevy ,I tried to sell the Dodge and could not even give it away , so i use it around the yard for firewood and any other uses i can find for it just to keep it used now and then . Fast forward to 2013 and i bought a rusty old 75 Duster to do a drive train swap on . I have not started it yet as i am about half way through fixing up a old house for the wife and i told her i wont spend any money on the car until the house is finished . Once i do start i will start a resto thread and i will most likely need some pointers . Well your car looks awesome, do you have any photos of your swap i would like to see them . All the best . Bob