Thanks everyone for the comments on flows. Didn't know it was that controversial
I may just use that origninal float valve, mostly because I already own a rebuild kit that has it. Though if I'm really better off with the viton style, I don't mind ordering one.
Is it necessary to paint the castings? Mine don't appear to be and they look ok, especially for a 30yr old restoration. I was planning on just hitting them with some carb cleaner to clean them up.