Will a 6 qt be enough?

I was just gonna say... What were the oil clearances set at on the old motor? As the rpms get beyond 6500 I feel two things HAVE to happen. Neither really have to do with oil sump volume or delivery. IMO, HV pumps are not needed unless you're running a road race, and the control of oil getting back to and in the sump is much more important than just more oil.
1. You need to add a little clearance. I run .0025 on the mains and .003 on the rods. Not plus or minus.. that is what needs to be there.
2. There can be no taper on the crank journals. None is acceptable. Factory specs are up to .0005" but once the rpms climb you have to make sure there is no taper.