I,ve never built a gasser using a fullsize p/u, but am building a Gasser (like) Anglia,
but I,m using a rack steering unit,, the old chassis had a saganaw steering box, that worked fine,, (GM Vega)
yours would have to be something simular,, whats wrong with using the stock c/10 unit?
http://www.google.com/search?q=vega+...w=1195&bih=667