G'day Dave,
the long stroke barrels won't fit on the short stroke cases, there are quite a few differences. Put that head in the for sale section.
What is the engine # on the cases and have you measured the stroke to make sure of which crank is in there? Short stroke A7 is 72.6mm and A10 is 84mm, the long stroke is 82mm but I don't know if it will go in the later cases, others here will know.
Still hunting for those pushrods, will dig deeper today.
Cheers