okay guys bought a mustang awhile back and I didn't build the motor, unfortunately didn't get paperwork either but the deal was still right. I'm curious to what heads it has and was wondering if I could get some help. Only numbers or labeling I have found was above spark plug on front bank of passengers side and it was just some numbers. Are these pro comp or do they label theirs else where? The guy I bought it off of said he wasn't sure but thought world products which I've had world heads before and they are usually labeled so I don't know about that. It's a built up 393Windsor with a solid cam, 1050 carb, setup to race runs strong. I know the pictures are bad but it's all I could get tonight so any help is appreciated thanks.