In Heroic Mode Blood Furnace, the rare drops from bosses have been adjusted to level-70 quality. Those drops are provided below, by boss.

The Maker
Inv pants plate 02
Inv misc cape 18
Inv misc stonetablet 05
Inv helmet 34
Inv bracer 08

Inv boots cloth 06
Inv axe 65
Inv pants cloth 12
Inv jewelry ring 59
Inv bracer 13

Keli'dan the Breaker
Inv weapon crossbow 15
Inv boots chain 04
Inv gauntlets 29
Inv bracer 16
Inv banner 03
Inv pants leather 12
Inv chest cloth 38
Inv helmet 12
Inv jewelry necklace 39
Inv sword 01
Inv chest chain 17
Inv bracer 09
Inv elemental primal nether2020