I have a 5.7 hemi out of a Charger and have looked at photos of the front of a truck hemi. From what I can see there are alot of things that are different starting with the timing cover, water pump, belt tensioner, dip stick, alternator, and I am sure there is more. If you were to buy all the stuff you would need new from the dealer it might add up to more than an entire junk yard car 5.7, I got mine for $500 over a year ago prices keep going down.