Im a true ford man, BB or SB car or truck I would rather have a sister in a whore house then a brother that drives a chevy, but when I did my 350 swap I had a 302 and a 350 next to each other and the ford was longer but not as wide as the chevy I wanted to keep the stock heater and not cut the firewall so I went with the chevy and a manual tranny, how ever I did have to run coolant lines to the back (under the bed) to a VW Rabbit radiator, and no matter what you will have to build or change headers.
Every one does thing diffrent, think things through and dont get upset if it dont work the first or second time, good luck