90 Merc
I had that same Merc inline 6 engine on a Cruisers, Inc. 19 1/2 foot tri-hull. Strong engine that would get it up on plane and top off between 28-32 @ WOT. Sweet, strong motor.
Still... I had a V20 I/O with a merc 90hp 4 cyl that would not plane unless it was glass smooth. I really wouldn't have less than a 140 on a V20.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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