Go find yourself a power steering gearbox off an Diplomat/gran fury cop car. Swap it in with a new pitman arm and you'll have a great cheap firm feel steering gear. I did this in both of my 70 challengers and it is really one of the best upgrades I've done on them. I got the box for about $35 at a local yard. There are a lot of good parts on those cop cars, especially if your running a smallblock. Check out the radiators, heads, disc brakes and kickdown linkage too, very nice.