Now would be a good time to replace the rocker bushings and shaft while you're in there. Unless it's already been done, most likely they'll be way beyond tolerance.
By the book, they have very close clearance, best I remember .006". Not sure why, and they will work with a good bit of wear.
Problem is, when you take everything apart, getting each rocker back to running exactly where it has worn itself into the shaft. In reality, impossible to do.
Be aware, the new bushings have to be reamed to fit the shaft. The aftermarket shaft I bought was .625". The original was .623", made the stands a press fit.
There is also a tiny roll pin in the back stand that positions the shaft. I think you push the rear stand forward? Pull it out with vice grips.
Unless you have the equipment to press and ream the bushings, and a lot of patience, a rebuilt rocker assy. might be a better option. You most likely won't find a used one that doesn't need bushings, but might be worth trying.