Direct shipping routes between South America and Africa in 1983

[Michael]

Hello everyone,
I'm an amateur novelist and I'm looking for information on direct shipping routes between South America and Africa in 1983.
Specifically, I'd like to know if any ships left Guyana (perhaps Georgetown) for Africa directly. If you're aware of such movements, do you know which companies and ships operated this route, the destination ports, the cargo carried, and the dates of these voyages?
Any other information on ships leaving Brazil for Africa would also be welcome.
Your help would be greatly appreciated,
Michael