Chances are, it's SOHC. The Sport was harder to harder to find WITHOUT SOHC in 2000 (not that I even wanted the OHV). The timing chain thing is definitely a hassle (mine was fixed under warranty in my 2000 Sport). Make no mistake about it.....the SOHC is a better engine. More HP and Torque and more fun to drive. While OHV is a reliable engine, I found it sluggish. I also got much better mileage with a SOHC. I've owned both. Assuming you're not dealing with the timing chain issue (it's pretty loud.....an incessant rattle), you'll be much happier with SOHC. If you are dealing with that issue, it's a costly repair and not simple if you're doing it yourself. My '97 Sport never had the issue. My '00 Sport did. Outside of that, I never had ANY issues with the SOHC.
Definitely try the "plastic cover"" method as it gives the 4.0L SOHC hint right away. If you're still unsure, post a pic of the engine. It's easy to tell.
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