Rav Huna bar Sachora was before Rav Hamnuna [Chulin (K67b)] and Rava at the end of Bekhorot. [He translated on the festival eve (Shabbat before the festival) before Rava, and Rabbi Nachman bar Yitzchak said: "Blessed is his mother, she was worthy to have given birth to a son like him, a firstborn (Sifrei A)."]
Seder_HaDorot,_Tanaim_and_Amoraim.975:1