I have used their services for my -725. Works for me in VA, not sure about MD. Only works for vehicles 1974 and older. Cost is about $150 for a light duty truck, bigger trucks are different. Here's how it works. Forget all about what you have in your hand. No bill of sale, bill of sale, doesn't matter. Fill out the paperwork with Broadway, and you "sell" it to them on paper. They process everything in Alabama (where they are, about 3 month wait), and send you back a completely legal Alabama dealer-issued bill of sale. See, in Alabama, state law says that vehicles older than 1974 don't need a title to sell, only a bill of sale. They provide all the necessary paperwork, and "sell" the vehicle back to you. Take the paperwork to most states' DMVs, and they will generate a new state-issued title for you on the spot, or mail it to you. Registration and tags are provided along with the processing. Real simple, once you see how it works.
This is how it worked for me in VA. May work different for you.