The easiest way to change is to fit the front of the gearbox to a Series 3 one. This is possible if it is a late Series 2a box with the same size layshaft as the Series 3. That way the clutch mechanism can be left the same as it is.
More and more evidence seems to be emerging that Holden engine adapters have been an issue with alignment, and you need to very carefully check the alignment when installing the gearbox, modifying the adapter as necessary.
John
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