1970 340 air cleaner dimensions?

Before I got started fixing my leak Jeep this am I made a crude wooden buck using a router and hammered out a piece using 22 gauge sheet metal. Its pretty crude but I wanted to see if there was any possibility of this working before getting too fancy. I think it might work. The buck (ok an oval hole in a piece of plywood with a radiused edge) is flat so I'm worried that I won't be able to bend it properly for the 8.5" radius. There is no hole in the air cleaner yet for me to try and fit it. I would then have to make a radiused buck which is a bit more work. I only need to knock out 2 of these so we will see how it goes.