all iI to say is the aluminum stands are trouble . Never any breakage with oem iron stands..All the rockers on an FE are supported on both sides, except for the ones on the end. Those are only supported on ONE side. This flexes the shaft. It also forces ONE stand to carry all of the load for that rocker, and it's a leveraged load. This works okay for stock cams with weak, stock springs turning stock rpm. For ANY street/strip engine using aftermarket cam/springs, extra support is needed. A $129 set of end stands is the cure.
For a dedicated race setup using solid roller cams, etc... A fully aftermarket shaft/rocker system is highly recommended... Way more expensive than the end stands.
do agree a shaft system from places like T&D for big race roller cams