That would work well if you didn't want it to look like an original 70-71 340 air cleaner. The radius is about the same, but the sides of the opening are square instead of round. I plan on practicing a lot on scrap sheet metal in order to get the holes in post #23 to look like the holes in post #6. It's going to require an inside die of some sort to be placed on the backside of the metal and then worked into shape from the front.