G'day mate, I am pretty certain that boat was in Empire Bay, where I live these days. I have probably had a beer with the previous owner at the boat ramp there.
I think Empire Bay Marina may have done some work on it recently. I will ask them when I get home tomorrow and I will ask the local boys about the boat.
Re the AQD40's, they are pretty good in the 130hp model, generally they will go for ever if well looked after. They are simple to maintain. Just check that the heat exchangers have been pulled apart and serviced in recent years, if not, give them a good run at cruise revs and then wide open throttle to check for any over heating tendency. Buy a couple of spare impellers and belts, fuel filters, hoses and enough engine oil to fill a sump, tools to do any jobs, fill her full of fuel, log on with the coast guard and enjoy the troll home.
Fuel burn will be about 30L/hr per engine at wide open throttle for those donks, so you could probably plan on about 40L/hr combined at planing speeds, and down around 8-10L/hr at displacement speed. You will lose a lot of efficiency above 7kts or so in that hull. At 10kts it will be making a lot of white water and maybe just about planing, but not being very efficient.
You will really need to come up and spend a weekend burning around Brissy Water to suss it out before you head off.
I will get back to ya,
Cheers,
Myles