YELLOW,I have seen grounds from the battery in several places.A car without a/c or p/s usually goes to a boss at the block that is used to mount the p/s and or a/c brackets. My 67 Dart that had both, the ground went to the p/s bracket.
HA ....you made me check two of them I have and they are both in the same place ....I have never had an A-body with P/S or A/C so I don't know how a Power steering bracket looks on there but I am assuming the power steering would use the two unused bolt holes towards the front.
