:agree: I have both. The 7.3 is my work truck and I wouldn't trade it for anything. The 6.0 is my daily driver and I wouldn't trade it for anything. The 7.3 is a dependable workhorse. The 6.0 is smoother and quieter and nicer to drive.I LOVE my 6.0. I personally like it better than the 7.3L. GO WITH THE 6.0L!!!
what year 7.3L does he have? i would shy away from a 03 6.0L if he can have him go with a 04+
my vote is to stay with the 7.3L if its a 99-03