Some Quick Thoughts...
-In regards to China, consider that the Chinese Communist Party would have still been backed by the Soviets, and they would have still been under the leadership of Lin Biao. In OTL, Lin Biao was the leader of the Red Guard movement during the Cultural Revolution in 1966, until his failed coup attempt against Mao in 1970. The frightening part to Lin Biao was the fact that he was even more xenophobic and Stalinist than Mao Tse-tung.
-In regards to Cuba, reemmber the fact that Meyer Lansky and Santo (Louis Santos) Trafficante controlled the country via Miami, Florida. The scary part is that Cuba would have been the site of drug tafficking starting in 1965, with cocaine and marijuana being transported via the Capri and Sans Souci Hotels in Havana. This would certainly attract the attention of DEA and FBI agents in the ATL...
-In regards to Vietnam/Indochina, due to continued Kuomingtang (KMT) violence, you would certainly have the "Golden Triangle" remain as a major exporter of heroin. Lai Chau and Nghe An Provinces would still be the major areas of insurgency by opium growers. To make matters worse, highlander groups, such as the Wa, Pa-0, Palaung, Lahu, Lisu, Hmong, and Akha would be targetted for ethnic violence because of the heroin/heroin trade...