Look close at how many miles are on it. The lower the better. Reason being, AFM has been a real issue on higher millage engines, but not all of them. Its kind of luck ofothe draw. You can instal an AFM delete box on whatever you buy. They are inexpensive and just plug into the OBD port. The 6.2 L is a beast if you can find one. Also a custom ECM tune will go a long way in the performance department.If you do a tune, then there is no need for an AFM delete box. That can simply be tuned out. Stay away from anything with a miss or a valve tap. Thats signs of failed AFM lifters, and that can cause piston failure. I you live where its hot ( in the south) dash boards are bad about cracking.