Well, I was poking around on the web (nah, I don't crawl.... haha) and gues what I found in the North-Western Island called "Australia"?

You guessed it - A SUPERCHARGER KIT

(see below)
The quoted power (185kW / = 250Hp) is based on the lesser 6VD1 from the Trooper, factory rated at 142kW = 190Hp)
That's a 60Hp increase, meaning that your 6VE1 would max out at about 270-ish HP or 200kW for us metricans.
Damn - that's close to the max rating for the auto-trans!

CHECK about the re-tuning of the PCM/ECU to suit the Pressure vs. Vacuum and the extra injector

Worth checking out...

http://www.capa.com.au/kits_holden_rodeo.htm


"Holden 3.2L-3.5L V6 Rodeo Eaton Kit
Retail Price: $6,995.00
Rated Horsepower of Kit: 185kW

Parts Included:
All parts are included, except exhaust
Eaton Supercharger
Cast Aluminium Inlet Manifold
Supercharger driven by factory belt system
Intake Pipework, inc. Throttle Body Adaptor
7th Injector with Aftermarket Management

Comments:
This kit is ideal for standard engines."