What's interesting to me is that age-old diagram referenced above that shows the crossover tube....we've all seen a million times. But I I hadn't looked at the diagram in years though, so it's interesting to see that "My" idea of feeding some of the mains off the left galley is being done....they feed the #1 off the left. That is significant because it relieves, to a degree, the need to feed all the main off the undersized right galley. So the improvement on #4 (and 3 and 3) is not because oil is slowing down, but because there is simply less burden on their feed. It would even be better if you fed 2 of the mains off the left galley, but that gets tricky due to the need to drill down to the block main web 'long and accurate'. And it would be better still if you could feed the left galley from someplace other than the right galley. Someplace with a big, accessible port coming from the oil pump feed. The joys of cast iron....
A lot has been said about the placement of the crossover...and I do think it is well placed....but it's also hard to overlook the basic fact that when you start looking around the lifter valley, you realize there are only a couple places you could put it regardless of 'smarts'.