I have a family friend who use to build stangs and race them. Gave us a few parts to keep and what not. While he was checking my engine out, he told me I have different heads? Me being the newb I am, I have no way to verify, so to speak. As well as gears and a tune. Since i've never driven a stock gt before, I had no idea my car had this. But the main question is, how the hell do I check to see what type if heads I have?