The 3.8 (early 90's to 95) and the Lincoln 4.6 fans both pull about the same cfm. Over 4000 with the high speed engaged. (2 speed fan). This system is so sweet and clean, and NO friggin' NOISE. That is the best part. I did play it safe and install 2 start up (Bosch style) relays, so that the draw wouldn't be too excessive.
A couple other guys earlier were going to install this on their trucks also. One did for sure, and had good luck, the other, I haven't seen his results. Using the Taurus/Lincoln Mark style fans is far superior to the fan clutch system, that comes from the factory, and so much quieter. You have more room on the front of the motor to work on if necessary.
If you have doubts, don't. Using a Ford electric fan (from the Taurus 3.8 or Mark's), is by far the best way to go. You should decide how much you can do mechanically, when ordering the probe. If you are decent, then tapping the housing for the probe wouldn't be hard, but if you think you might have a problem go with the "thru-radiator" probe. It goes thru the fins and read by the temps that go thru the fins. I personally like the screw in sensor. I don't like taking chances with something falling off or out of the fins, and not turning on the fan when necessary.