Well, after a little more research, the only years I can guess at is 87 and 88 Generation 1 B6 323s, 91 to 94 Mercury Capri, and the Miata; though I'm still unsure of the years.
I'm starting to think that the head on the block isn't Mazda because there isn't any Mazda Cast Numbers which isn't any issue other than finding a cover. However, I researched all of the Kia Sephias and Rios but they are all Exhaust Cam Distributors. The only pics I found where the distributor was affixed to the intake Cam was 80s models 323s, unknown years Miatas and Mercury Capris.
I guess the only way to really know if one would fit is to make sure the engine is a B6 and that the Distributor affixes to the Intake Cam. I purchased a Valve Cover yesterday from a Mercury Capri B6 and it fits, of course that doesn't really tell me what Mazda Cover would fit and sadly, there is no "Mazda" on it...

however, there is no "Ford" or "Mercury" either; just "DOHC" and "16 Valve"
Sorry this request is so vague. But I know you guys know your B6 engines and can help. Thanks