Not without modification
Oldsmobile
Depends on the model
Toyota
extra large
They might be. You will have to try them to see. Check to see if the '97 has the 16 inch wheels for the oversize calipers. If so, the '87 most likely has the 15 inch wheels. They would only fit in this case with wheel spacers, 1.25 inch, and then you will have to grind down the top of the caliper say 1/32 of an inch to fit the wheel. If both wheels are 15 inch. then a fit sounds good.
Campagnolo freehubs are compatible with Campagnolo wheels and some other brands that specifically design their wheels to be compatible with Campagnolo freehubs. However, they may not be compatible with wheels from other brands that use different freehub designs. It is important to check the compatibility of the freehub with the specific wheel brand before making a purchase.
yes if you have the Oldsmobile motor mounts. If you are asking if engine parts will interchange....Absolutely not.
zero if you do not wheels on it
Yes, 16 inch wheels were an option.
No, you cannot put 27.5 wheels on a 29 bike as the wheel sizes are not compatible.
No, you cannot put 27.5 wheels on a 29er bike as the wheel sizes are not compatible.
Unfortunately the lug pattern is different, the wheels will not interchange. You can use Thunderbird or Cougar wheels.