Rebuilding 73 duster front end

I wanted to know how I should go about this. Im looking to replace my converter and headers also, so i wanted to know if I should remove the engine and transmission, so I can remove the entire K frame or just Jack the car up and replace the headers then the front end and then the TQ..Keep in mind this might be a 1-2 person job in a Garage at my house with jackstands, cherry picker and a jack only to support the car.