Question if hydraulic lifters did they pump up If they did it's not in the block. Check the rocker to see if they are drilled at the push rod end.
In the mid 70's I built a 355 small block and had one pushrod that had an end insert that never got drilled, turned the rocker arm blue.
Early stock distributor will have lifter galley ring at the bottom. Needs to be indexed correctly to feed oil to the lifters. OR….you can grind the depression all the way around and not worry about position.
Found a couple things, front of block needed clearance for the timing gear with the roller conversion. My builder did what he could to make it right, had the block stripped again, watched new bearings installed and tossed the adjustable rockers for a new set. It's been a few miles ago. so things are going right.
The adjustable rockers would not have any thing to do with getting oil to the heads, as it comes up through the hollow push rods to feed the top end stuff If one of the galley plugs are out you would have a mess on the floor DND
I had a sbc with a set of brand name roller rockers that were getting very little oil to the top end . Put stock rockers on and it oiled like crazy the hole in the rocker push rod cup didn't line up with the hole in the push rod. I though it was a flaw but maybe they thought roller rockers didn't need as much oil.
The cam bearings on a small block chevy don't need the oil holes aligned with anything. there is a groove completely around the block side of the bearing. The oil hole only needs to be in sync with the groove in the block. The oil holes in the cam bearing only oil the cam journals. The chevy cam bearings must be installed on the specific journal . they are numbered and each has a certain position. The chevy cam bearings have nothing to do with oil to the rocker arms or lifters.
No they don't need much oil as they can run in a mist, you can install restrictor with a .50 dia hole and they work just fine
May not be applicable but on my 71 LT-1 SBC with solid lifters you install restrictors to limit oil to the top of the motor. Opposite would be true for hydraulic lifter applications.
I ran a 383 sbc in a sprint car in the early 80's with a hydraulic cam. I built the block for a solid lifter roller, but it failed the distributor gear in a short time and a friend gave me the hydraulic cam to try. I had put plugs in the rear lifter galley feeds and .062 (1/16) holes drilled from the lifter galley to front cam bearing oil groove. That way, the crank got almost all the oil and only a dribble went to the top. The hydraulic lifters worked fine with that amount of oil and the valve covers didn't fill up with oil I needed in the pan. Ran that engine 3 seasons before selling the car and had no oiling issues.
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