I am using a late 904 that was set up to work with my 273, and the guy that did the work said that he had everything required to set it up to work with a 360 when ever I decided to go that route. I do not have a magnum intake. Right now I hav a very good running 273 4bl with 3.23 gears and have decided that it is much more cost effective to build torque than it is to go with more gear and some type of overdrive in a 65 Valiant. That is why I want to swap out to the 360, I have available both the 91 and 96 motors complete, both running and for the same price. The only real advantage I see with the magnum is it has the complete serpentine setup with AC and power steering pump and alt. which would be clean.