If you are using pressure fed rockers from a stud at 5 o'clock on the timing case the feed goes up the engine in front of the exhaust pushrod tube and to the exhaust rocker. A pipe goes from the rear of the union on the exhaust rocker to the inlet rocker. The rocker pipe you have is for the feed from the return to the oil tank. This goes to the rear of the engine.
The photo below is not ideal, but you can see the vertical oil feed pipe to the exhaust rocker on my Red Hunter.
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.