16" wheels off a Ford dually would not fit over the rear drums on my 1959 3800 with 16" brake drums. The OEM wheels were 18" tube type. A single wheel setup might work, depending on how far the inner bead ring is from the lug bolt flange. No go on the front- - -the extension piece also contains the outer wheel bearing and race, so it can't just be unbolted. You would need to find front hubs for a 4-wheel 3800 instead of a dually.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!