Its been awhile since I've worked on one, but if memory is correct, It should be 6 qts for a pan drop/filter change, and 14 on a completely empty trans. That should get you in the neighborhood. If you think the converter still has some in it, then start with 6 qts in the pan, start it up, and put 4 more in right after start up and you should be close. Just ajust as needed from there.
1999 Z28 M6~ Black on Black T-Top, Slp Lid, Corsa Cat-back, 18" Z06 Replicas. 13.32@106 Best 1/4 2.12 60' Traction still sucks. Bone stock. Soon to be 12's, Gotta get back to the track SOON!