These are my thoughts:
Run:
76” by 36”
(6. 3 ft by 3 ft)
Approximately 18 square feet in the run.
Recommended is 10 square feet each, so (generous) 2 chickens in the run.
I don't know the dimensions of the coop itself, but I'd put maximum of 2 chickens in there, as is.
Are they able to free range?
If possible, I would try doing something like this:
https://www.backyardchickens.com/threads/my-renovated-prefab-coop.1440258/
Which would add a lot more space, then put the renovated pre-fab into some sort of fenced enclosure for the run (or just let them free range if thats an option)
Sorry, don't mean to be hijacking this thread.