I recently purchased what is supposed to be an '89 Evinrude 70 hp, rebuilt of course. Problem is, all serial number stickers are gone and I am not sure what it really is. The cyl head number is 329835 which comes back to a 91-92 60/70 hp 3cyl. The block number is 334474 but I have not been able to match that to anything. Anyone know where to point me?