It's a NA (1990) with the engine from a '91 or '92. Not sure why. It hasn't run in seven months and is in need of a new alternator and battery. Also needs an oil change. He wants me to do the work and get it road worthy once again. I'm going to his house on Saturday to do the work for him. Any tips for the alternator swap? I've never worked on a Miata before. Maybe he'll let me drive it if I'm lucky.