Yes the one with the springs and such, some call it a damper plate as well
Engine is an indmar assult, there were 2 different engines. The 325 and 340 I think? I dont know which one I have for sure cause it doesnt say anywhere but I think its probably the 325. And as for transmission, from what I read on indmar if the boat has a walters v drive ( which it does ) than it has the zf hurth inline.