I have a 17 osage pack canoe. I have used a 4hp two stroke, 5hp fourth stroke, & 7 hp long tail motors I also used 1 & sometimes 2 trolling motors.
The 4 & 5 sent Me along at about 12 mph, 7 @ approx 16 17 mph ( on plane and scooting).
I use a tiller extension with the out boards, and have run the full length of taney, some table rock, a little bit of the Missouri, and allot of the Mississippi in the Winfield area.
This by myself, and or loaded with gear and two people.
Hunting and fishing in most imaginable ways.
It's very efficient.
And it takes some getting use to.
Mine is rated for a 5hp.
Your choice of a 3 up should be just fine.
Just start slow and practice. And wear a life jacket.
Good luck