Thinking of the ramifications of all this, with Fidel Castro dead in such a blatant murder-y manner, he will become a martyr for the Communist movement the world over. The blame will fall on America as the obvious prime suspect and even with 'deniability', if someone is captured (or decides to brag) then the truth will surface regardless.
Raul Castro will very likely become the new President of Cuba, though I expect some in-fighting and a power reshuffle in the Cuban government, right now in this era the Castro regime had the full support of the USSR and the death of Fidel won't see the regime change that the 'Free Cuba' crowd would want, and by the way just want to create a new right-wing dictatorship and NOT a democracy in Cuba.
The only way you'd get regime change in Cuba in this era is with Fidel AND Raul being killed combined with an invasion of Cuba, an invasion that would see the USSR respond with an invasion of Western Europe and nuclear exchanges.
So, Fidel will get a hero's funeral, Raul will become Cuba's President, and he will likely seek revenge on America and it's leaders for the murder of his brother.
I hope the Secret Service has got it's shit together now, otherwise there might be a third dead President and we haven't even gotten to the 70's yet.