powerrodsmike, the new Corvair boxes are steel instead of aluminum like the originals. I don't know about trying to find an original vega box? Flaming Rivers new vega boxes run $319.
techron, I think I mis-stated what I've heard. the reversed Corvair boxes cause a lot of bump-steer.
The PITA is the Corvair box and steering arm were already mounted before I bought the car. I only need the drag link. I'm not that knowledgable about steering/suspension, but some of the local hot rodders are telling me to ditch it and go to cross-steer.