I am working on 68 383 GTS convertible. Trying to get as close to original as possible, within reason. For example the dist I have is correct part number on housing but dated 69. I can live with that.
My main concern was the shaft length which has morphed into other points. The vac advance style I only saw on prestolite dist and the FSM had me concerned.
The obsession on the correct shaft with springs was just me trying to match close to stock as possible. Which then peaked my curiosity on the different looking weight slots.

Looks like I have all the pieces, just need to carefully drill the pin hole next.