This happened to me. DEMAND A NEW JEEP. New engine will appear on carfax and vin #’s won’t match. Stellantis will put you on top of the list for a 2022 built and you will end up with new model year for your pain and suffering along with a Mopar Maxcare 8 year/125k extended warranty on your new one FOR FREE for your troubles. I even ended up with new transmission replacement with just 67 miles on my second one. Very sorry this happened to you. Especially during the holidays. It will work out for you in the end.I'm not concerned about the new engine. It's all of the teardown and reassembly that bothers me. Everything will have to come out of the engine compartment to get that 6.4 out. I wouldn't be as concerned if I could choose my own mechanic.