hey tc - you included a link above for the warning, but there wasn't a pic of the lifters/annulus, and i think i know what they're talking about but......is there a pic available?

and yes, the 'accidental' '68 manual is simply used for referencing mechanical/proceedural changes

and now, pre'68s comment has me scratching me head. 14psi hydraulics? i wonder if the internal springs were lighter