Greenie, don't forget that I'm running a Merc 200 on my V21. I have had zero problems so far. Yes, I know that there's a difference in weight, but the torque issue you mentioned should not be any problem at all. These boats are rated for 200+, so I'm thinking that you'll be fine in that regard.
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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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