Check out the restoration subforum here. All the info you need. You had some type of wood, which is now likely mush. Doesn't really matter what kind.
https://forums.iboats.com/forum/boat-restoration-building-and-hull-repair.40/
I didn't know about winterizing until last year either...I think it's the process where you dunk the outdrive in antifreeze and then replace the block in the spring. (And I really need to make it to Australia...)
Doesn't matter about the boat, we need to know about the engine to get the right manuals. That looks like a VP 280 drive, so not a '91. That HIN looks like m79 (space) I (not 1) to me.
Care to give us a hint about what we're working on? Is it a boat? I'll assume it's an A1G1 since that's what I have. So then yes, that donut is supposed to be there.
