I would use the clearances as specified in the Hepolite Fitting Instructions sheet but then run in carefully using running -in oil for 1000 miles. In my experience, the 4F OHC engine does not get too hot, but it suffers badly from being too cold in the winter, leading to condensation in the cam chain cover. I would not use an OHC 4F between the end of October and the beginning of March in the UK for this reason, unless I changed the oil after use.
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.