IMO Look for factory, Bentley, Glenn's, Haynes or Chilton's in that order.

Some driveline similarities to the W123 not much else.

Remember to check the oil in the injection pump, red cap "OEL"

Had a manual w/AC, great car. Post pics of yours if you wish.

Good luck!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer