i've got a 94 ranger with a 2.3 liter engine,with 654,000 miles on it,i wanna replace since i went out and bought the parts cheap and there nos,the cam,cam bearings,lifters,rockers,fuel injectors and throttle cable,how big a job is that?it's seems to me,that once the valve cover comes off,getting to everything should be pretty straight forward,the dealer quoted me 15 hrs to do the work?does that sound right,i would have thought that this was a 4-6 hr job,can anybody out there enlighten me as to why there claiming 15 hrs according to the book.......thanks