I am looking to buy a Mariner 90hp ELPTO. I believe it is an '85. The serial# is A726655. The guy wants $1500. I was wondering if 115# in all 3 cyl was acceptable for this motor. I have never owned a merc so don't know to much about them. Also I have controls from a 90hp Force '90 I was wondering if they would work for the mariner.