I have had this same issue somewhat but with 1 50s Columbia I do still have the OG headset cups as I was repainting the bike since it wasn't valuable in the state it was found. I can measure the cups when I go back to it. May be this Friday. If you're interested I can snap some pics and bring the cups too if you need'em.
Thank you - That could be very helpful. I do think I'm going to take a more modern 32.5mm standard press fit "old school BMX headset" and shim up the headset cups with some shim stock. My restored bikes are not for crazy riding. I cruise around on them, so no jumping or that sort of insanity. I realize the frame is 70 years old and i'm just 19 years younger than the frame at 51 years of age. I'm too old to do anything too crazy on a bike now, not worth getting hurt.
I've done quite a bit of work on this frame and invested a good amount of money into the bike - so yeah I'm not stopping until I get this bike rolling and riding.
Thanks for your advice.