From the 1955 Chevrolet Truck Manual Second Series:
"King pin bushings used on all 1/2 ton vehicles are the floating type and when replaced in service, either standard or .010" oversize, they need not be reamed to size as all service bushings are machined to finished dimensions...These bushings should be free on the kingpin but may be somewhat snug in the steering knuckle."
http://chevy.oldcarmanualproject.com...55ctsm0306.htm
The old busings in my truck pushed out. The replacements were not so loose as to push in but barely needed to be tapped in. I applied a little bit of blue Loc Tite to the bushing OD because I felt I should.
Also, the pins are a slip fit or mild tap fit in the axle rather than the press fit found on larger vehicles. The tapered retaining bolt provides the tension required to keep the pin locked.