Rocker arm side play

Bruce your best bet is to spend the extra money and get a good name brand set like Comp, Crane, Hughes, Racer Brown, and I know there's a couple more that I'm not remembering. I've experienced some of the cheap rockers and their accuracy is barely tolerable at best. I had a very nice looking set of Comp look alikes that sell on E-bay and the geometry was off pretty far. The roller nearly rolled off the valve tip at full lift. I know the name brand ones are quite a bit more expensive but their worth it. Sometimes you can find a good used set on the boards too so keep your eye out.