Lots of post on bleeding. I would fill the master and have a helper. On mine I unbolted the slave and tilted the zert to the top run a small clear tube into a small jar with the bottom of the tube inside some fluid in the jar so not to collect air. Slowly push the clutch causing fluid to go into the jar. and return quickly. Keep an eye on the master so not to run out of fluid. When you have no more air bubbles come out keep the clutch to the floor close the zert . Worn seals can cause air to enter the system without any signs of leaking. you say your system is low, then you have a leak and this needs to be fixed or you will be doing this ofen.
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85 GT 4spd 2.8 1 yr blk
86 SE 4spd 2.8 2 yr blk
86 GT Auto 2.8 new to me.
87 SE 5spd Future 4.9 6yr