Heh, lucky for you I'M A NINJA!
Just click
here to run the search.... The URL has the search query predefined.
I don't know of any options for the 1G other than the basics of adding a boost controller, fuel controller and/or upgrading turbos. The engine didn't make it to the North American market so other than the odd one showing up in Canada from time to time they're not really heard of. There are a couple members who do own or have owned them that have posted here in the past and hopefully the search will lead you to them. Other than all of that you might try the UK Supra owners forum
www.mkiiisupra.net
Good luck with it.