[Mr70]

I have seen some veeeeeeery early 1970 production vehicles with the #065,(Aug.~early Sept.1970 assembled),as they probably used the old remaining inventory up first at various plants throughout the country..and there was overlap w/the #811,so either one was possible.
I think they started casting the #811 pump in mid 1969.
Honestly,I would opt for an #811 on yours.