I built the Engine with X Heads and stock non adjustable rocker arms and shafts
2 years before swapping to Trick Flows with PRW Rockers.
And had driven it about 20k Miles.
No problems with valve train at all.
The oil hole in the Trick Flow head is much smaller then factory, but they say it's plenty.
If it were a magnum with Trick Flow heads
All they get is pushrod oiling
The PRW Rockers are made to work with both LA and Magnum Engines.
So adding pushrod oiling to this 340 it's getting double the oil.
The side clearance was set at .010