you may have to do some trimming on the fenderwells, and of course modify the radiator support to accomodate the new front end. If you want to spend the additional time and expense you could also build a fixture and narrow the front sub to the desired track width. If you choose to narrow the crossmember, then header fit is an issue and the motor mounts would have to be relocated. As Pat said, the narrower A-Arms are a better alternative.