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Sounds like you have done almost everything possible to maximize the efficiency of your horsepower motor. Some aero mods would help (I'm thinking belly pan). I am sure you don't want to ugly up your cars profile in the name of efficiency.
I was thinking about a higher overdrive gear in the transmission. How many RPMs are you running at your desired speed? My guess is they are quite low and there is little to be gained here.
I know the Holdens are typically overbuilt to deal with the bad roads found in your neck of the woods. Is there any potential for weight loss?
The lifter thing is interesting. Didn't know that was out there in the aftermarket. I would make the changes you mentioned and see where you end up. If that didn't do it...Like the other guy mentioned, a smaller cam with the psi turned up may be your best option. The boost would cover the reduced power being made on the motor. PM me or post the changes you see with the lifters, that’s just cool that they have those. I am picturing an adjustable screw that bleeds oil based on how far you back it out. Is that correct?
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