Thanks to @mr48chev and @dsraven for their suggestions. I managed to get all the sleeves out and the races necessary to rebuild the steering box. Pics below -
The trick with the sawzall blade by hand did the trick. I made a 90% of the way thru cut, then used a small chisel to peal it away from the part, no damage to the part and the sleeve is out.
Tomorrow I'm going to use a Vapor Hone to clean up the steering box body before I give it a coat of paint.