Expert 5K+
Posts: 9906
Location: Lower Mainland BC | No shops in your area that do old school radiator re-coring? If so, they most likely could re-core your heater core.
Alternatively, eBay seems to have a bunch of cores for 1963 Chrysler that might work for you:
https://www.ebay.ca/sch/i.html?_odkw=1963+chrysler+heater+core&_osac...
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