Best way is to have them honed to size at an automotive machine shop, they can ensure that both bushings have the same centerline (something you can't do with a wheel cylinder hone)
Second best and not far behind is to have them reamed using a reamer that pilots off the second bushing while cutting the first, (and the reverse) again to ensure they share the same centerline.
I've done many of them with a reamer, Lempco made the best ones I've used and over the past several years I've managed to pickup a mostly complete set of reamers with their pilots.
Also had several sets honed at NAPA, they do a fine job.
Grigg
