I always had good luck with 6 quarts and using an AC Delco PF52 on a stock car that still had the oil cooler hooked up to the radiator.
If you go with the PTE Oil Filtration kit that relocated the oil filter to over in front of the battery, then I ran 6.5-7 quarts and used either a PF35 or a Mobil 1 filter that cross references the PF35. I also run one of Kirbans strong earth magnet, duct tapped to the oil filter for added protection. It's not strong enough on it's own to stay put on hard launches at the track. Not pretty but functional.
One more tip...
Valvoline is your friend.
Just my O2's worth.
Patrick