Why not just pick up any solid axle Chevy ( 44 or 60 ) and convert it to cross-over steering? If it has to be a Chevy....or find a full size J truck, and use it?
Brett, the cross over is an aftermarket.
There are a million ways to accomplish it, and they range from pennies cheap (heims) to still pretty darn cheap (under $150 total)...
If you need cross over pieces I probably can put one together from the scrap pile. But as you know Im a cheap bastid and all mine use heims...