Is it a 1 piece or 2 piece flaxplate? I have had some 428s from 1966 that had a 2 piece flwxplate, which was heavier than the more common 1 piece unit. I have only owned 1 410, from a 67 Mercury, and it had a spoked 1 piece flexplate, with a welded on counterweight, that looked the same as the 428 flexplates I have.