Early A-body Headers

Hey Frank, as you know the drivers side crossmember has the provision for the exhaust pipe. The easiest thing to do is duplicate that on the passenger side and you should be fine. Might even be easier to take two transmission cross members to make one, I am not sure if the bolt spacing is the same on both sides. If I was doing it and retaining the original cast iron manifolds I would go with the oblong exhaust pipe for the section the will pass under the passenger side and leave it alone! You can get them here:
http://www.ovalexhaust.com/ovaltubes.html