OK, so I figured out that my Goodwrench 350 DOES have self-aligning rocker arms.
Below is a picture of one of the stamped self-aligning rockers off of the motor (left), and one of the roller-tipped rockers (right) I want to use on this motor. It would appear to me that these roller rockers qualify as "self-aligning". If the picture turned out good, you can see there is plenty of meat on either side of the roller that would make it impossible for it to "slide" off of the valve stem.
The distance between the meat on either side of the roller is about .100" wider than the indented part of the factory stamped rocker.
Am I off my
rocker here

, or will these do the job as a self-aligning rocker arm?