Converting a dual snorkel to a 70 71 340 air cleaner

Now you have me wanting to mod one. I think I can duplicate the rolled openings by making a die. Just cutting the hole does not look finished to me.
Not too long ago you could buy one of these for $400 restored. Then someone came along and decided theirs was worth $800 and everyone followed suit. I guess if people are foolish enough to pay that much then they are actually worth that much.