A complete set of engine gaskets can be purchased on eBay at this very moment and I have purchased these kits before and they are of good quality.
Check out item number 370525189119 on eBay and see what you reckon.
Also the Airflow Club of America Club Store can supply new cowl vent seals as well as windshield seals that replicate the originals.
As an Airflow owner I can confirm that you wont find a rubber seal for the steering column where it passes through the firewall.
This seal is relatively easy to make though.
If you wish to discuss airflows then maybe you would like to contact me directly on email email@example.com
Incidentally I own a 1934 Chrysler Airflow Croydon SE that came from England to Australia many years ago.
I also own a 1936 Chrysler Airflow 8 Coupe model C9.