Thanks for the prompt answer! I've just wrote with the sales manager from EngineQuest and he told me this:
Thanks for your interest in our products Luis. The MA on the front of that particular cover is a “mill mark” or “foundry designation” We use several drop cast foundries and die cast foundries around the world and these markings help us identify which foundry poured the timing cover. Yes, these are made for EngineQuest and have been part of our product line for many years.
My doubt was because of an original Mexican unrestored 65 Mustang that has that timing cover.... I was wondering if that timing cover was actually original to the car....as that Mustang was assembled in Mexico, maybe for the law regulations that were on those years that stated that every car sold in Mexico must have at least 60% of mexican components....maybe this timing cover was assembled onto the car here in Mexico....
But, with the response that sent me EngineQuest this doubt has been clarify....and I now know for sure that that timing cover was in some day replaced.... But that take me to another question:
How long or how many miles does an original Ford timing cover last in these cars?
Regards
sanluis09