The top collar is press fit onto the hub.
My internet searches turned up the same as yours.
I'll see if I can find the service manual that I eventually used... it wasn't great but I got my 67 column done. I made a tool using rubber protector and large hose clamp to grip the collar for removal and install.
Gary
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68 Acadian SS-350 auto/AC driver
70 Nova SS-396/375HP Bench Stick
72 Nova SS-350 5sp Mini Tubbed
67 Chevelle Conv. SS-427 clone
70 Chevelle SS-454 LS-5 M-22
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