Is their any way to adjust these rockers? Or will they have to be replaced?
There's no way to adjust the stamped rockers. If there is too much play you'll need a longer pushrod or adjustable pushrods. But let's back up a minute.
We need to look at the top of the lifters to see where the piston or cup is located first. We'll take one of the rockers with a lot of play first.
The lifter needs to be on the back side of the cam. (lowest point, valve in the closed position)
Now if there is a lot of play in this rocker, look down in there at the top of the lifter and see how much gap is under the wire that holds the piston from coming out, to the top of the piston. Might have to use a bright led flashlight.
Here's a pic of a hydraulic lifter showing the wire clip that holds the piston or cup, from coming out of the lifter itself.
If the wire is touching the piston, like in the picture, and you have a lot of play in the rocker/pushrod, then either the pushrod is too short or the cam might be wiping. (wearing off prematurely) Rockers can wear also, at the valve stem and in the pushrod pocket. Also it could be a bent pushrod causing the excessive play.
If the piston in the lifter is below the wire, with excessive play in the rocker/pushrod, then the lifter has lost its prime. Either it has leaked down or has dirt in it, keeping it from "pumping up".
Hope that's not too confusing but check this and report back. Don't worry about side to side play, just the gap that would be from the top of the valve to the rocker.