The build sounds good but the specs are not complete for a guess at the HP level. We would need to know valve sizes, compres. ratio and headers (Extractors for down under right?) if ya got them.
Is the intake a Stealth from Weiand or an older intake?
Now for the size carb your running. It will also depend on gear axle ratio with it's intended useage.
The 600 has enuff to feed the engine. The 670 would more than likely be better. It would get my vote.
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