Mine was the same way. The two frame rails were 3/4" off in elevation both front and back (probably twisted from a front-end collision). Everything sat wrong, and lining up the fenders was nearly impossible. The local frame shops wouldn't touch it while it was off the car because they said it might screw up the final position of the motor mounts. Instead of install it and take it back I got a good used one and everything went back together just fine.