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Tony Starks hands Steve a bottle of 7up laced with Banes Venon (which Cap drinks immediately) and then leaves Steve in a room alone with Gamora (Steve has been lead to believe that Gamora has been stealing money from Uncle Sam)...

Fight to the Death or KO...no BFR...who wins?

PS...no Time Gem for Gamora...Captain America has his shield.

So the venom amplifies strength at least 10 times right.
So Cap at best would be a 50 tonner with the ability to hit with more than twice his hitting strength due to martial art technique.
I say he can win the majority then.