7.5 quarts here. 572" hemi running 8.90s at 150 mph at 3900 lbs. Haven't had over 7.5 quarts in this motor in 10 years and never had a problem.
I use the cheap 440source fab'd aluminum pan. Milodon single line external p/u.
http://store.440source.com/Oil-Pan-Fabricated-Aluminum-8-Quart/productinfo/200-1076/


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax