I believe so, but I'm not positive and I'm not a mechanic.
No
No
ANYTHING will fit into a 1983 Caprice Classic. Are you asking if it will bolt up to the tranny?
78-87 Monte Carlo is a G-Body GM car that is smaller than a 77-90 Caprice which is a B-Body GM car. The seats in a Monte Carlo will fit in a Caprice, but they may not look quite right. You will need to do bolt location modifications. I would not recommend trying to use a bench seat from a Monte in a Caprice. It is not wide enough.
no.
Not likely since the 93 Caprice 305 was fuel-injected and the 86 Monte Carlo 305 was carbureted
I believe the answer is no. I have wheels that fit on a camaro, an s-10, and a gmc s-15. They don't fit on my 93 Caprice. Bolt pattern is different.
While a 74 Monte might be considered a "classic", such a car is not considered collectible and likely never will be.
Not without major modifications.
A 1986 Monte Carlo SS can be purchased at federal and provincial auctions, private auctions and online. The online websites where a 1986 Monte Carlo SS would be found are Kijiji, eBay, Amazon and specific classic car dealers.
77-85 Impala, 77-90 Caprice, 78-83 Malibu, 78-88 Monte Carlo/El Camino
Historically, those two cars had the same size wheels on them, so yes.