Force had motors made by Chrysler and then later on by Mercury.
Run (not walk or crawl) from anything that's powered by a Force outboard. We called them "Farce"....and for very good reason. Unreliable is a HUGE understatement.
If you can get the rig for the right price, get it, remove motor and throw it off the bridge, and repower the boat with a Yamaha. Really anything but a Farce, I guess what I'm saying is that ANY motor is better than Farce I mean Force. Mercury is ok but after working on a few lately, I'd certainly not buy one. Guess I got spoiled with Yamaha.
I wouldn't put a zero dollar value on a Force. I'd take about $50 to own one. Yes I mean you'd have to pay me $50 (minimum) to take one and that would cover the cost of fuel to haul it to the scrap metal recycler.