lifter galley crossover tube

It's a very simple explanation as to why Chrysler's don't oil the rods. There are only a couple of ways I know of to correct it.

Oiling isn't really an issue up to ~7800 if everything is correct. After that, it goes wrong in a hurry. I know there are people claiming they turned 8500 forever. I think they lie. To make power at 8500 even on 340 inches requires much more induction than I see people using.

So...the real issue isn't flow, pressure, volume, turns or anything else. It's the fact that engineers KNEW decades ago that the rods need maximum oil flow at about 70~ ATDC. It moves a bit due to rod ratio but that's pretty much the standard. Every Chevy ever made has the oil timing at 70 degrees after TDC. They will oil well past useable RPM with less pressure and volume than a Chrysler. Or a ford.

So, the issue is where are the oil feed holes in the block relative to the oil hole in the crank? If you look at the GM stuff, when the crank is 70* past TDC the oil hole in the block is lined up directly with the oil feed hole in the crank. The oil feed hole in the block is at 12:00. Full volume and pressure is delivered to the rod bearings at max load, just as it should be.

Now look at your Chrysler. The oil feed hole in the block is closer to 10:00. Yet the hole in the crank is in the exact same position as the GM crank. What it all means is the oil gets to the rods way early.
Also consider as RPM goes up, the TIME the oil feed holes are lined up is LESS so it amplifies the issue. Full groove bearings help and I always use them but it won't fix the timing issue.

I've never asked, but it's may be possible to have the crank drilled with the oil hole rotated back so it is not past the feed hole at 70* ATDC but it is possible that you can't move the hole that far.
If the feed hole in the block is moved, that would fix it, but that is impossible unless the engineers fix that.

The fix I used was to block off all oil from the factory feeds. Cross drill the crank and and drill and tap the main caps and feed oil in from the bottom. This is a PITA but it works.

That's the only fix for rod oiling that works. Crossovers, lifter bushings and all the other stuff published and done for decades will not fix a high RPM oiling issue.

If you have issues with oiling at lower RPM, some thing else is wrong.