What to do about Rocker Arm Adjs.

What do you do if all of the adjustment is out of the rocker arms. In other words, I can't turn the adjustment bolts any further.

The engine runs great, it's that the lifters are just so damn noisy.

I can take a few of the rockers and moved them up and down with about 1/8th" gap. It's a wonder that the push rods haven't came out.

Is there a longer rocker arm adjustment bolt that can be bought or do I need new rockers?

There's hardly any ware on the rockers. Can't tell if there is any on the push rods due to the mushroom style head.

Bare with me, as I'm not real savvy on 6's