I picked up a '72 1400 merc that has a cracked lower unit housing. It still goes in gear and sounds fine but the PO cobbled it together with JB weld. I was just curious what years are interchangable? Even if I find just a housing I can swap the guts over. A friend of mine has a 93 75hp with a blown powerhead, would this lower unit housing work? I'm sure they are different. His also has tilt and trim which I would really like. Is it compatable? If not what years would be.