If all you're trying to do is eliminate the torsion bars for header clearance, you don't need to convert to a full rack and pinion front end. I believe Hemi Denny sells the parts to swap over to coilovers using your stock steering box and linkage. Alternatively, you can simply buy a set of tubular upper control arms and modify your stock lower control arms to run coil overs. Lastly, you'd have to tie the shock tower into a snout bar, or the front frame rail somehow as the shock towers were not engineered to support the full weight of the front end of the car.
