Tom,
You may want to talk to:
http://antiqueradiators.com/ These guys are located in Maine. A few years ago I dealt with them and they seemed OK.
I'm not sure about a honeycomb in the '34 but I do know it was stock in a '32. I had one made about five years ago and it's not inexpensive. Current cost is going to be $1500 to $2500+.
You want to have it done right up front, the honeycomb is tough to repair. I have samples of the original core Packard used. They used two types of material, brass for the water tubes and copper for the fins on each side of the tubes.
If you do have any future problems with the radiator, under no circumstances use a product such as Barr's leak stop in the radiator. Due to the narrow passages a leak stop product such as this will clog the core.
If you don't want to have a honeycomb core made there are shops that will use a modern core (tube & ribbon) and put a false honeycomb on each side of the core.
Regards,
Dave
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