My last Mustang. I bought this car new in April of 98. 4.6 auto. It has been a fine car with 0 issues until last week. I have had a lot of Mustangs. I gave 3 of my 4 to my Sons, and Grandson. My issue is the motor is destroyed in the 98. I bought a rear ended 2016 5.0 GT auto. The engine, and trans are going in my old 98. Any specific issues I should be aware of before starting this?