I'd recommend getting a temp plate from NJ or NY if possible... then get it the hell out of mass as quickly as possible. You already have the title, right?
Mass temp plates are nonexistent, and mass laws about them are retarded. Basically, if you are a mass resident, temp plates gotten for a vehicle from another state are not valid. If you are a non mass resident, you will not be issued temp plates to get it out of the state. If you are a non mass resident driving in mass with valid temp plates from your state, they can't touch you as long as all the paperwork matches up and you're within the temp plate's period. A friend of mine got pulled over with a CT license, CT temp plate, on a car bought from MA, in MA, and they couldn't find a way to ticket him. Cop was not happy, thought he had a good catch and got nothing.