First off, and I'm sure you know already, but always wear a PFD.
The PO to Clinton float is very long on a low water pusling schedule. Lot's of shallow water, several good shoals, one nasty shoal, then the rocky final mile. Running the engine could help but your going to have to spend a lot of time running the river before you find lines that will allow you to run it without tearing the prop off. Much easier to do on a solid one turbine flow, but still plenty of places to rip off a prop. I'd say the first few times you try this float you'll be in the water over ten hours, especially if your getting out to wade some shoals.
From the PO boatramp, you can put in and motor downstream to the first set of shoals and get back just fine, or you can motor upstream about a mile or so with care.
The millers to PO float is much mre doable in length for low water. There's a few places you could use your motor but for the most part I'd save it for the area around the interstate if it's windy. Quite a bit of good wadable water, but also a lot of deep water. And you probably already know from Massengill upstream. Watch out for the upper end and the lower end of MI because the riffles get pretty rough with no flow and dragging your boat will proabably be the norm there unless you time a pulse as it's falling.
Now the canoe with a motor would probably kick some major butt up in the weir pool!
You can paddle a lot of it until you learn the lay and then that little motor would proabably be perfect.
Oh....BTW. The Clinch seems to fish pretty well with one turbine rolling, streamers and deep nymph rigs. Two turbines is much tougher with sink lines and streamers, but pretty dangerous out of a canoe.