Bob, if you could get a couple of pics so we can all see that you have under there and how it is set up, that may help. I know when the crossmember is installed the car must be sitting at the correct rake angle otherwise the crossmember will not be sitting level with the ground (front to rear level). that could throw a wrench into things if the rake angle is different than original set up. have you changed tire sizes front to rear or done anything that could mess with the rake angle? it is something to check if you have a crossmember style front end where they swapped out the original crossmember to install the fatman stuff. another thing to check for is front wheel bearing play, play in the rear suspension joints, if it is a leaf spring set up back there, are the u-bolts tight and the axle centred on the spring pads? rear axle end play (in and out play at the wheels back there), wheelbase comparison between both sides of the car, if you disconnect the steering box from the rest of the front end, does the front end move freely side to side (while jacked up)? does it track straight down the road? (no dogtracking). all of this should have been checked by the front end alignment boys if you had a 4 wheel alignment, but then, they are paid by the job, not by the hour right?
seems like you need to get the steering box centred and adjusted properly, check all the rest of these points and repair as requires (if anything), and try it again.
just a few random thoughts,
keep us posted