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To consolidate a lot of what's above and maybe add in some additional thoughts: what you want to end up with is kingpins and bushings that are concentric but differ in diameter by a very small clearance amount. By using the reamer you are assuming that the kingpins are straight, smooth and concentric, and at the reamer size is appropriate. Yes, you're using NOS, so the quality of the kingpins makes at least their dimensions more reliable. But by having these honed in by a machine shop you are not only avoiding spending $150+ for a reamer you may use on only one or two projects, you are betting that all the dimensions and alignment are proper. Last time I rebuilt a Model A front end was in 1970, and I reamed the bushings and everything fit fine. Now faced with doing it again (for likely the last time in my life!) I'll likely sub that out.
JayJay