Oldmics. I hear what you're saying regarding the valve springs and the retainers.
Charlie Brown does not have the information base that you have. I've come to believe that there are numerous contradictions in the paper records that we work to scour and can fall into swearing by.
Natoli, Ron May, Jim Weatherly, Don Hyde, and those they know that I'm sworn to not name (this stuff is an information card game for some in these circles) have seen first hand what I've efforted to share. I don't state anything I haven't come to believe, But I also have high regard for what you and others like Marvh on our Forum have shared as information they have found.
The most recent item that brings home what I'm getting at about conflicting information was the Forum member who wrote about the end-of-production '57 C code 'Bird that had a data plate showing that his car came with a 3 speed with overdrive transmission. As you know, '57 C code 'Birds were supposedly only produced with 292 engines with 3 speed standard transmissions behind them. Go figure!

Again, I respect and appreciate ALL that you and others share on this Forum.
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York