If you mean engine and drive train parts....yes.
Some interior and drivetrain parts will interchange but no body panels
Parts for a 71 Monte Carlo may be hard to come by. Try the Auto Parts Warehouse. Sources may be found at the Monte Carlo Club but the best source may be eBay.
Yes, there is virtually no difference in the dimensions and installation hardware of body parts between 1995-1999 Chevy Monte Carlos.
One can purchase replacement parts for a Chevrolet Monte Carlo car at 1A Auto. This site offers a parts type list for one to find the replacement part needed.
none
Although they share the same platform, they shared no body panels, so the answer is no.
Parts for a 1979 Monte Carlo can be found online at JC Whitney, OPGI, and CARiD. One could also check car magazines for adverts of people selling spares.
A 2003 Monte Carlo fan assembly diagram can be obtained from most Chevrolet dealerships. The diagram can be found at most auto-parts stores.
none, all the steering parts are sealed.
Most parts will not.
No, the transmission from a 1982 Monte Carlo will not fit in a 1991 Cadillac. A transmission can be purchased from a salvage yard, transmission shop, or even from an auto parts store.
An auto parts store can turn it off for you.