I think TrollerDave is correct, I doubt that is factory for '89. Could you get some pictures of directly in front of the intake (probably under the oil pan)? What you would be looking for are signs of classwork to fill the hole that remains when the intake is set back. There may also be an aluminum plate, welded or bolted on to the front of the intake and filled with epoxy. Also look underneath the boat for signs of cracking. Anything would be an indication of a modification after the fact.