It's actually 87kW@ wheels.
Basically, Ford autos are geared for smoothness, and the Holden sacrafices this a little for performance.
As mentioned above, the manual EA will pump a large amount of Holdens, even some V8's.
The weight of the cars makes a difference, but gearing is the main problem in this case in my opinion. I would say that a manual MPI would beat an auto MPI even if it were carrying around 200-300kg more.
CAUTION: Slippery When BOOSTING!