From that picture the boat could be about anything ... kinda' looks like some Thompson's boats (though they generally had the "clinker" look going), but that style was a dime a dozen in the 60s and 70s (not that it's bad).
It's a used boat ... it's all about CONDITION. Some good readin'
HERE.
If the motor doesn't run, and the hull is junk ... he should be paying you to take it.
If the hull is good and the motor doesn't run ... you might give him a little for it (think of it more like a tip for holding the boat in his driveway)
If the hull is amazing and the motor doesn't run ... it's worth a little more than the "tip"
If the motor runs and the hull is junk, it's a little more complicated ... ya' kinda' have to base it on the motor, and what value it has
If the hull is good and the motor runs ... in my area, that's a $700 to $1,500 boat.
Pay close attention to the paperwork part - it can be an amazing pain in the rear to get a boat "legal"