Joe covered it pretty well. A couple of "quirks". I went through this as well.
The antique plates are available for any vehicle over 25 years old, true. The YOM plates are the same classification as the antique plates (I know a man that "cutom makes" YOM plates and they're legal. His 'cuda says "70 440"). VERY limited use. Also, even though the sticker is not required, at any time a state trooper can pull you in your antique and "inspect" it. It bettter pass, regardless of how it's "used", or you could be in for a tow bill. Even if only going to shows etc., it still must be able to pass.
If you're going to use the truck on a regular basis, as a "truck", there's no advantage to the antique plates, and could cause some headaches. VA Atate Troopers are known to be "humorless" individuals.
There are no emmission tests in the Richmond area. Can't say about Tidewater or around DC.
Welcome to "The Old Dominion"... (:-