Welcome.. I've never heard anything of swapping an expedition motor, but shoudl be the same thing(except for the aluminum block, right?!). I would say use the injectors from the cougar, if I am right, the injectors from the expedition have different harness, so not unless you would like to splice your harness, then go for it. I use almost everything out of the exploder engine, the rest that I did not use, I could not sell it on ebay.. Good luck..
Nitrous and boost go together like peanut butter and jelly
Nuttin make you feel more like a man in a Thunder Cougar Falcon Bird