Here are some rocker shafts that should be returned to the wild. They came with some Buick stuff but I am not sure, note the plastic ****ons for retainers. Help would be appreciated, see if you can beat Squirrel!
Buick 350 was where/when the plastic retainers began, so '68 at the earliest. Not sure if the bigger Buicks of the same period used them, too, or not.
You could do some poking around here, too, if interested: https://www.v8buick.com/index.php?forums/small-block-tech.8/
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