not an air suspension problem... thats a geometry problem. Airsprings are not going to make that front end do anything that is does not do through normal suspension travel. The only difference is that you can physically see whats going on with an airsuspension because you can manipulate the height.... kind of hard hanging your head out the window watching your front tires at 80. You mentioned that this is on a 48 Buick ... is this the OE front crossmember he is working with ir is this an aftermarket crossmember? Has it been subframed ?