1968 Dart Air Cleaner Housing

Thx Gents. I've never seen an air cleaner without a side air entry. I noticed the that the bottom of the air cleaner was not sealed, but it didn't seem to offer enough area to allow proper air flow. Now I know it does just that!
I've only had my Dart for a few days, but thanks to the forum I've already identified a local guy who deals in used Dart parts. I've already been in touch, and I'm going to see him next week.