273 valve covers

I've always liked the black 273 valve covers with the fins. I've found some on line but, for the most part they are not in great shape. I was wondering:
Does anyone manufacture reproductions of this cover? I didn't think so.
Will they fit on the 318-340-360? Thanks.
Finally, does anyone have a picture of the finned black Edelbrock valve covers on a motor? I have their catalogue but wondered what they looked like on an actual engine.