[hotrodA]

I've probably done several hundred kingpin jobs on big trucks in my life, so early Fords were like toys.
The Sunnen honing machine was always the choice over reaming, for the finish and bore concentricity. Photo enlargment of the surface of the bushing showed that reaming left peaks and valleys on the surface. The peaks would wear off fast since there was reduced surface contact with the kingpin, resulting in premature clearance. The Sunnen honed bushing left a virtually smooth finish with more surface contact area with an infinite number of microscopic grooves to hold the grease.
Clearance should give a "palm press fit" of the pin into the lubed bushing.