Thanks for the reply, BomberMann. 650 area code? That looks familiar
With the adjuster at the clutch cover completely tightened (turned counter clockwise), the marks still aren't lined up as the picture shows in my original post. Dimple on the armature is higher than the dimple on the clutch cover. I turned the adjuster all the way out, then back to notice any movement which wasn't much.
No noticeable visual difference between the OEM springs and the EBC, although EBC claims they are 15% stronger than OEM. Buddy of mine used those springs in his '76 550 and they work just fine.
No trouble fitting the last plate, the kit I got had 8 plates, 7 the same and 1 larger (which isn't used on the '74 550).