Small block rockers?

I'm running Comp Magnum rockers on the 360 in my 67 Barracuda. Overkill for my engine, but I had a set sitting around so decided to use them. They are probably 15 years old but have seen few miles.

100 miles after installing them and a pair of out-of-the box Indy LAX heads, the intake valve for the #7 cylinder stuck open. Piston bent the valve head, and the engine made all kinds of funny noises, but I drove it 2-3 miles home, and, amazingly, the piston was fine, as was the Comp rocker and, if I remember correctly, even the valve seat and the pushrod (might be wrong about the pushrod, though). Put a new valve in (honed the guide just a bit), and have had no trouble since. (And, of course, the Comp rockers weren't the problem.)

Arrow in the pic below points to the rocker for the stuck open valve.

IndyLA-Xhead.jpg