The motor sits further back than it does in the Mustang IIs. Therefore, the weight of the motor is shifted somewhat to the rear springs and a lighter front spring is usually needed depending on the motor used. We used a 500 pound rated spring. This is the finished front suspension with the optional bolt-in sway bar and transmission K-mount. After installing the front crossmember, the guys at Kimbridge decided to remove the body to make it easier to paint the whole frame--nice but not necessary.