I've had great luck with Rislone engine treat for cleaning and quieting lifter noise. One quart of Rislone in place of one quart oil when you change it.
When I had my top end apart last summer (@136K miles) it was seriously clean in there. Looked like the engine had 5K miles. Had the mommy van...
New clutch for the fan comes in two varieties: standard and HD. Last one I bought was ~$50. Pretty easy to swap out. Take a wrench and loosen, but don't remove the bolts/nuts before you remove the accessory drive belt. Makes it much easier to get 'em broke loose.
It does take the clutch a...