Even though the tag is missing, look it over real close, the model and serial numbers are stamped into it through the label location. So even if the tag comes off, the numbers stay.
There should also be a metal tag on the bottom side of the motor.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.