727 to 5.9 magnum

Are you using the stock magnum EFI? If so then you need to use the factory magnum flexplate. Just use a drill and elongate the one bolt hole that doesn't match up. You will also need to cut a notch into the bell housing for the crank sensor. It's VERY easy. I've also used the factory magnum EFI TV cable and bracket to operate a 727.