I had a thread early on my purchase of a fifteen foot 1974 lund fiberglass boat. I was planning on pushing it with a 15hp motor. This deal fell through, and so now I have my boat sitting without a motor. My friend has two mercury outboards, a 6hp, and a 7.5hp. He is willing to give me the 6 for 200 or the 7.5 for 250. Do you think these would push my boat around just for this year? I'm sure I could get the money back out of the motor next year if I should choose to upgrade. I know these are pretty small motors. All of the lakes in my area have 25hp max anyways. I am not really looking to zoom out there, would just like to know if that would push it at an ok speed. Here is the pic of the boat by the way. Its 15 1/2'

Either would work better than and electric TM but neither will work great.   Seriously doubt you will get on plan, and can just about inusre you won't with two people in the boat.  Depending on the condition and age of the motors, you might be able to sell them next year when you find what you're looking for.  They will be much harder to sell that if they were 9.9 or larger.   Anything smaller than a 9.9 is hard to find a buyer for especially in a pre 80's when they actually had 10 - 15 percent less prop shaft hp that their stated HP.

What's the outboard rating for the boat?

While the small motors will push it I would look around for at least a 15 to 25 hp.

I found a 9.8 HP Mercury that I think I am going to go with. A little better than the previous two. Seems a reasonable price to me for about $300. Its much newer as well. Thanks for the help guys. I am not really looking to get on plane or anything, just want to be able to get from point to point at a reasonable speed. Next year I am planning on buying a 25HP, but I want to wait until next year for that as I will have to install steering and all the rest for that.