The standard gearing of hi range in GQ is much lower than the rb was ever designed to push so I dont really see you having a problem at all.
Add reduction gears as you have, and you should find the hp and torque is something only a select few of us get to play with.
I really think you should not get to carried away with big hp engine as this mtr is going to surprise you.
little things like larger injectors fitted can be tuned for lower power but give you the option of turning the wick up if you retune without the extra expense of buying another set of injectors.
Go for reliable power, the GQ's gearing will take care of the rest.
You have me wishing I had the spare cash to do this my self, but I dont think my better half wants to be setting any speed records towing a trailer lol.
cheers
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