I decided to repair my 300CD, the Chevy Suburban is eating my wallet, now I'm looking for a good used engine. If I go for a Turbo engine (mine is a '79), is it possible to replace the heating/ air condition system as well, do a complete swap?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).