Many thanks to all that made suggestions - useful and otherwise.
A happy day this morning in Slowy's shed.
With a bit or spark plug lead re-correction to match the diagram Modena posted earlier, a recheck of various settings and a crossing of fingers - I achieved the outcome in the link below!!
Have video so it did happen - lol
New Engine First Start 5 June 2014 Video by slowy59 | Photobucket
So no issues with the rebuilt motor at all and it sounds sweet thanks to Wellco.
It was just the shift of the coil pack location, a six year hiatus and Slowy incorrectly plugging into the alternate set of cylinder numbers on the coil packs.
Another major stage achieved.
Now I can move on to other bits of this rebuild as a happy chappy.
Cheers gang
Steve