My recommendation, due to the rarity of the color & age, is to not use any steel wool, razor blades, or abrasive cleaners to clean it. Especially if you dont have any experience cleaning a grill with them, you could damage the porcelain. Practice on a few modern, less valuable, grills first.
Soap & water with a brush will remove some of the gunk and give you time to reevaluate what it really needs after that.
Dont get in a big rush to restore it back to new, take your time figuring out how far you what to go with any type or restoration. Its usable in the meantime, and its beautiful as it is.
Additionally, removing or altering any of the parts will detract from its originality and character.
In my opinion there is nothing anyone can do to make the grill more beautiful than it is.