Luckily the heater core comes out from the engine bay side. Removal appears to be straightforward going by the attached pages from the shop manual. Also included is an exploded parts view from the parts book.
The a/c evaporator case was used on '61-63 Specials and Olds F-85s. Lower half is part no 3149992; upper half with baffles is a 3150107. Finding a used one looks to be the only option on these parts.
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