Issues with pre - 70's 318 in a 73 Duster

What I would do is go post 70 everything and get a rad to match. Alternator brackets will need to change as well. Pulley placement will change too.
Good luck!

In order to go "post 70" on everything, how deep would I need to go? I know the water pump is different, and in turn the timing cover would be different as well. How much other stuff would I have to change?