How many have their parking brake cable above the spring? It seems to fit better that way but after detailed reading of section 4-3 of the 1968 service manual, I spotted a couple things.

3. Note: When installing spring, make sure spring is positioned so that parking brake cable is on underside of spring.

Also

9. If new mounting plate was installed, transfer parking brake cable retainer bracket to new plate.

I thought the parking cable fit better above the spring and 68 did not have parking brake cable retainer bracket.

I would think the service manual would be correct but I have seen errors.