ax & sinful, you actually both have a legitimate point. There's no doubt that oil surge is a crank journal's worst enemy but having said that, its a matter of working out how much over fill is too much. As long as the crank couterweights aren't swimming in the stuff you should be fine, on the other hand if your crank is hitting the oil on every rev, you're asking for a major disaster.
The only safe & sure measure is to do it the right way the first time......deeper & larger capacity baffled sump and oil restrictors with a good catch can.....problem solved.
Plus it's cheaper to do it right the first time......speak to some of the boys that have broken bottom ends due to surge or over fill.