

After Che left Cuba, they used the soviet model which had some benefits and allowed Cuba to enter the soviet trading system which brought even more benefits, but then that model had to be abandoned because what Che said would happen did happen: corruption, individualism, petit bourgeois consciousness, inefficiencies etc because the soviet model had a big emphasis on material incentives, bonuses if you over fulfilled the plan, etc
A bit after Che left they implemented the Soviet system, then got rid of it the 80s, then the special period happened after the socialist bloc started collapsing.
Under the Soviet system firms literally operated like businesses
Che’s Balanced Flows System planning was an attempt at firms would simply be transferring the goods between each other, their finances would be managed centrally by the central bank etc
His idea was that firms in the country wouldn’t be buying and selling from each other and therefore the Cuban economy would be ‘one giant factory’. There would still be stuff sold to consumers, still be wages, money etc
I haven’t read about Allende, and just watched a couple of videos that mentioned his project. But based on what those videos said, it sounds like he wanted to do a similar process of what Che proposed, by using computers, yes