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I hate to take the wind out of your sails, but according to Headgames, it's rare to even need 272 cams unless you're making well above 1000 horsepower and need more RPM, I'd say 8000 is low for them. It will sound cool, but these motors respond very poorly to NA mods. I was thinking about doing a 1st gen "ISF" build with a 3UZ though.
GSC provided some dyno charts of the s1 versus s2 over at supra forum. Even they showed little to no gain at 8000rpm between the two but a lot of low rpm HP loss with the s2. The s1 is slightly more aggressive than the 264 and the s2 is more aggressive than the 272 for reference.

NA engines are cool but with only 3 liters to work with…

It’s hard to make more power on the IS300 cheaply no matter which route you go but doing the work yourself with help a lot.
 
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