Its your pump so ya gotta please yourself. If you post the question you will get a lot of 'leave it be, it's only original once posts', because a while back the restore it group got a lot of flack, even DB, so are shy about saying.
I personally think it would look great restored in that lovely mustard yellow. And I am thinking it as a showpiece for my living room, not one of many somewhere else. But that might not be the yellow for the brand you want. Based on the big rust spot, was the pump originally shell with a shell shaped decal?
It's your pump and unless you are going to resell it anytime soon and therefore might want to leave the decision to the next owner, you gotta please yourself.https://www.youtube.com/watch?v=uAHR7_VZdRw