Thanks for this post. Picked up some date correct valve covers for my 69 Swinger with the same issue. I will be trying this method to repair them. Haven’t read your entire thread yet but saw pics of the car at the beginning, is that T5 Copper for the exterior paint?
Based on other members T5 Copper cars if it's not T5 it's damn close. I have no specs on what the paint mix was. Wiring clips finished coming up shortly....