Steve,
I would consider using lead as filler in this area. The factory used lead back when these cars were built and of course body shops used it a lot in past years although it is somewhat a lost art there are still those who still use it, mainly because it is superior to modern body filler in certain applications. I am not experienced in body repair and paint and I have never used lead but I know there are some that do even on this board. You might be able to find a you tube video on the process. No special tools are needed just learning the process and maybe some practice.
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Tim Corcoran
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