Yikes-- talk about an excavation job-- the front suspension has 50+ year old grease and layer upon layer of dirt.  I found some green and yellow paint inspection marks on various components of the front suspension.  Removing the kingpins ended up being quite a chore, and does not go as smoothly as the Service Manual would imply.  I had to run down to Harbor Freight and buy a hydraulic press, which made short work of the kingpin removal.