Yep,you're ok as long as you only want to move your V slowly. I use a 9.9 myself, as do a lot of other guys here. It's great for trolling, or, in an emergency, as a get home engine... just don't expect to go very fast. As to the shaft length, you're talking 5 inches difference, and you can counter that by just mounting the kicker bracker a little lower. Remember, you're not going for optimal placement for doing 40 mph up on plane.. you're just looking to push your boat. Get the prop in the water, try to get the anti-vent plate even with or just below the bottom of the hull and you'll be fine. 
PS: Since I don't know what kind of bracket you got, one final bit of advice. Make sure you can tilt your engine up and out of the water before you mount the bracket. Some small brackets for tiny outboards don't have enough clearance between the engine mounting plate and the stern unless it's up real high so the outboard swings up over the transom.
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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; 02-02-2013 at 01:00 PM.
Reason: Added content
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