Thanks Sergeant Heretic for a larf!
Communist revolutions in Central America while not ASB, would last about 5 min with an actively engaged Mexican Army deciding to roll them back using Kaibile tactics from the Guatemalan Special Forces. Of course, Mexico doing it on a wider scale would be a PR nightmare for the Mexican government but the effects would be telling. There's plenty of motivated, capable rightist Mexican, Salvadoran, Guetemalan, and Honduran forces to squish the insurgencies with minimal American support.
Cuba's nominal support for the Communist insurgencies would prompt a Mexican boycott of Cuban sugar, any help from Petromex to help develop their offshore oil, and leave the Cubans even more economically DIW than OTL etc.
What happens when the rightist forces have squashed the insurgents and find themselves working for the narco-barons or becoming narco-barons themselves as happened during the Colombian drug war?