Q.1: Yes, NATO would essentially "go crazy" around 1980 and attack PACT. Circumstances would be historically accurate.
Q.2: It would be a full-scale invasion with the goal of getting rid of or at least neutralizing the entire PACT-faction.
Q.3: Well that's a question in it self, would they feel a need to? Would there be a reason for them to get invaded by any side? Or would they themselves pick a side and get in the war?
1. Is 1983 a good year (ie if Able Archer resulted in conventional attack)?
2. Ok so we assume that NATO focuses not only on IGB, but also on the North-west (Invasion attempt at Kola) and South (invasion attempt via Greece, Italy and Turkey in Balkans and Caucasus) and the Far East (US attack on the soviet mainland there).
Now, where are the US mainland assets are sent (Far East or Europe)? How much does NATO take to prepare (it takes 1-3 months to move the US mainland assets via sea), as otherwise WP would preempt?
3. I guess Finland, Austria, Sweden, Switzerland remain "armed neutral", India does not participate at all, China is a big unknown.
We need more missilez code for the missilez god.
"Tactical Ikalugin inbound on this position in 10... 9..."