Am surprised your radiator guy cannot find a core to fit as other shops have been able to do it -- although a new core is definitely not a low budget repair.
Problem with other mfgs radiators is nothing else found so far is a direct drop in fit. Usual issue is the hose locations and mounting to the cradle other mfgs used are all different. In order to use another brand either a new mounting arrangement needs to be made and on most you need to figure on some kind of hose rerouting.
Having said that, some have managed to make a Ford Bronco radiator work by changing one or both of the above.
Start with this most recent thread and also check out the other packardinfo links within those posts to older threads about the same issue. There is a link to the Bronco radiator as well.
There are other radiators mentioned in the older threads that some have tried and I believe there are even photos of some of the mounts made in a couple of the older threads. Not all the photos may show on the older posts since the server upgrade a couple of years ago messed up the links to many of them. If they are gone I have photos of a couple -- but not all -- of the mounts.
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