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Yes I believe actually the 1986 to 1992 Volvo 240 4 doors are all interchangeable parts but I'm not sure for 1985 and earlier models.
Call Crutchfield. They have the installation kit, diagrams and instructions.
Yes
All around Disc, 13" I believe
1 to 4 , front to rear
Not 100% sure about the '87, but there is no PCV valve on the 1986 Volvo 240 2.3L. Flame trap and Oil trap, but no PCV.
No, they are not user serviceable
Dextron D/M
met poep
Yes. They are exactly the same as long as the newer wagon is also a 240 (not a 740). All 240 hoods are interchangeable from 1986 on.
The Chiltons/Haynes 72300 has the vacuum circuits divided into the emissions, Fuel and brakes sections of their manual covering each vacuum hose.
long answer: yes