Engine 2.8 Engine Differences

As I stated in another post, I am not an expert on the Cologne V6 by any stretch of the imagination. A quick Google search yielded this webpage that says between the 74 and the 75 and later engines, there is a heat riser in the heads of the later models. Assuming that that is the only real difference, check the casting numbers of the head. That should tell you what year the latest revision was to that head and most likely what series that you're running. If I had to guess, it's probably a 75-78 engine since there are most likely more of them running around given there was a 3 year production run vs a one year.....