That motor is listed as a 2speed motor most places. If it has 3 wires coming out of it, then it's probably 2 speed motor. You can easily verify by testing it on your car's battery. If you do this be sure to hang on to it tightly because it will have a lot of torque and will try to take off when you put power to it!
The bigger question is if it actually fits your fan blade. Ford updated their design in 91-92 and as a result the fan blade itself may or may not fit. Most books do not recognize this running change that Ford made.
I've never tried to fit a Taurus fan so I can't comment on that, but sometimes if you buy a used fan the blade might be rusted onto the motor shaft and so you might not be able to remove it from the Taurus shroud and install it on your SC shroud.
If worse comes to worse, I have a pile of SC fan/shroud assemblies available. Shipping is kind of expensive though.
The dual speed 92-95 Taurus fan fits your existing shroud, kind of. It leaves about a 1/2" gap between the fan blades and the Thunderbird shroud. It is not as efficient for that reason, but it still works pretty well. You will need to swap the blades along with the motor because, as Dave alluded, the exact shape of the motor shaft changed along the way.
I know this because I just recently swapped a Taurus fan into my car's shroud. I went this route because I could find a Taurus fan with 70k miles for $50 in a local junkyard. The aftermarket single-speed fan (Four Seasons part # 35171) was $67 and required cutting the harness. I am pretty sure there is a 2-speed motor available from Four Seasons for another Ford application, which could be adapted. But that motor costs a lot more ($150+?) and also requires cutting the harness.
It should be noted that the motors Ford installed in cars from this era are very good. They move much more air than a typical aftermarket replacement. They have the 2-speed feature that works better and extends fan life.
My fan lasted almost to 200k miles, and even then, the high speed still worked. But the front bearing was really shot. It made a growling noise in operation and had obvious play. I opened up the motor and saw that the rear bushing is still in great shape. I bought a new bearing for the front and will replace it when I have time. It is a little bit involved to replace the bearing, but I think it will give good results. The low-speed brushes were a little worn out, but the high-speed ones are still pretty good. The commutators (yes, 2) are in almost pristine shape. I think this motor can last another 100k miles once I get it back together. Once it is back in the car, then I plan to sell the Taurus fan. I can probably get all my money back for it.
Ultimately, I would not throw out any fan motors for this car unless you really are sick of looking at them, because they can be fixed to just as good as new for a minimal cost.