This joint and pipe is one of the problems on the Mk II. The original O ring seals are good for one use until disturbed and fibre washers may well perform similarly. It is possible (just) to fit 1/8" BSP unions with olive connections into the rocker blocks and use an 1/8" copper pipe between them. This works well but is very tight to achieve. David Jones used to do the mod as standard on the engines he rebuilt and I had zero problems with his work on my first Healey or my Mk II. So I have replicated his method on the current Healey project and on two other Mk II engines, one of which has now done a respectable mileage. I can take some photos and post them if anyone is interested but be warned that the clearances are small and you will need access to both lathe and milling machine.
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.