Historic tags do not require a vehicle inspection in MD. Because of this it cannot be your daily driver. Evenings, weekends and a mileage maximum of 2500 miles annually I believe are the limits on historic tagged vehicles.
A hot rod or custom or engine swapped ride can be historic tagged. But if its a daily driver, you'll need to inspect it and tag it with regular plates.
And just so you know they (LE) do notice historic tagged vehicles and stop them if they see an opportunity.
S