Your cam belt may be to tight.but more than likely what you are hearimg is normal for a truck of it's age.
At around 100,000 mile's the little 2.3 will show it's age. That's not meant as a put down, these are great little engine's.
Remember with all that stuff moving around ( rocker's, follower's, lifter's) your going to get noise, especially with age.
When in doubt :DON'T
Valley Station, Kentucky
Dream EXPression Racing