If you should decide to go twins, you'll be hard pressed to find a better power to weight to size combination then a couple of older Merc "Tower of Power" inline 6's. Twin 115 hp's should fit nicely, they're small, light, thin, and they are a solid, reliable engine that should continue to give years of trouble free service. Look for something in the mid 80's year range. I think that 88 was the last year they were made, not 100% sure though. Merc added a 0 after the engine size, so a 115 hp is called a 1150 model. Since they are an inline 6 they have plenty of torque, which makes for great hole shots with about a 19P prop on them. And a 115 is enough to get a V20 up on plane. Not sure if a 90 can do that. 
http://www.youtube.com/watch?v=G2pjzxbwab0
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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.
Last edited by Destroyer; 04-02-2013 at 10:05 AM.
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