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Forgot about this post - Late update, but better than none i guess.

Manifold went on fine, had to redo the oil drain line due to slight difference in fitment.

The tune needed a surprising amount of work given only the manifold was changed, fuel was on the lean side after the change.  Suspect the crack in the old manifold may have been there for some time and previous tune changes had accommodated it.

Definitely more responsive down low than the tubular manifold. No real change to top end, though does feel more linear through the rpm range now due to response improvements.

Has not been back on the dyno since the change, so no numbers yet.

The tune needed a surprising amount of work for the change which was a little unexpected

You have probably already sorted this out by now Spetz, but for reference Dynoseek is worth checking out - It has a good list of performance workshops searchable by location and category.

http://dynoseek.com.au

It may help yourself and others next time you are chasing a local workshop for this kind of thing.