I assume Siri (5) and Benelli (84) will clash again. Maybe this time, Lorscheider (79) may be the non-italian compromise candidate.
I fixed a mistake. I accidentally included an already dead cardinal.
Anyway, It's difficult to predict who would have been pope without the use of OTL knowledge/hindsight.
At the very least, I can try to give out some possible candidates:
Italian
-Siri: Archbishop of Genoa, age 74. Still possible to be elected, but his traditionalist views would prevent him to gain support from the majority of the cardinals. ITTL, however, John Paul II's assassination may convince some cardinals to elect someone who will be vocal against the Soviet Union.
-Casaroli: Secretary of State, age 66. Was valuable to John Paul II due to his anti-communist work, but was perceived to be "soft" on Communism. Some traditionalists have accused him of being a Freemason. Could still be papabile, however, his nephew's (alleged) future betrayal makes it more complicated.
-Benelli: Archbishop of Florence, age 60. Was papabile in the last election, but his health could be of some concern...
(Honorable mentions: Carpino, Ursi, Felici)
European
-Lékai: Archbishop of Esztergom, age 71. The only Cardinal from the Warsaw Pact nations, besides Macharski and Rubin, who would have participated in the conclave.
-Willebrands: Archbishop of Utrecht, age 72. Was papabile, but his background from the increasingly heterodox Dutch church makes it awkward for him to be elected.
-König: Archbishop of Vienna, age 75. Suggested that Wojtyła be elected pope, may be looked upon as a decent non-Italian candidate, but his age may prevent him from being chosen.
(Ratzinger was not yet Prefect for the CDF, so his name was not strongly connected to JPII at the time.)
Non-European (Probably too soon to occur, but I'll give it a shot)
-Gantin
-Sales
(No way will they elect an American )
For now, that's all I could think of. I could definitely be wrong. I wonder if the show will have any mention of it?