1G performance parts can be a bit limited and as much as my 1GGZE is fun, you might be better off getting a 1JZGTE. A bit newer and a lot more parts.
That said, plenty of people on here are making decent power on stock internals with a modern single turbo.
http://www.toymods.org.au/forums/forums/47-Dyno-Results
This is not a bad place to start. Just search the forums for 1ggte. Lots of people have them with single conversions.
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