noob need some basics

so im new to everything that is mopar and i tell you what im enjoying but i am starting my first mopar project which is a 1972 dart and it was a v8 car with power brakes and power steering, etc just about every thing you can get but, it has no engine so i bought 2 440's and got some 727 trans with it as a paclage deal so here are my questions which is a better engine 1968 or 1972, what are the basic things i need to get to swap this engine in to the car, ? such as motor mounts, clearance issue, trans mounts, raditors, etc.... i need to know everything that i can possible get to get me going, thank you very much. pics of your setups and info is great thanks