The MPC shows a different evaporator & case assembly part number between 68 and 69-70.
It shows the outer (engine side) assembly to be the same from 68-70
Not sure what the difference would be IRT the evaporator assembly. It might be the vacuum fittings or some other minor thing.
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2015 Chevy Express 
2024 Cadillac LYRIQ
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