Your first pic matched what I saw on a 1958 235 I had with the pivoting pickup. The last one matches what's on my 1951 216.

Probably just GM building "better mousetraps". Or the bean counters telling the engineers to make them cheaper. The 216 style has lots of parts compared to the later ones.


Kevin
1951 Chevy 3100 work truck
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Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.