AdrenalineAddict

I've gotten a few engines from various sources over the last couple years. All the housings say 12A, but with different styles and fonts. The port sizes are close, but definitely different. Is there a good source for identifying the housings to determine where they came from or from what vehicle they were pulled? I'm assuming JDM housings use the same marking (ie 12A, Toyo Kogyo, etc) as US Domestic Market housings? I don't have the crazy dual distributors of the early RXs or anything like that, but am curious to know what I've got without taking stuff apart.

Thanks in advance!
Greg