It depends what you mean by limits. The limits of it in a form that will give you reliable power are around 150%, or 205 hp. If it was FULLY built, you could reliably get another 50hp out of it, I think, but it's hard to find forged internals for that engine.
Once you start pushing past the 150% mark (just over 200hp for you) then reliablity will drop more and more. However, when you consider that most Toyota engines will run well past 200k miles, cutting the lifespan in half or even less, isn't a bad tradeoff!
The absolute limits of it are around 400-500hp, but it wouldn't last long
Remember too, it has a lot to do with how the power is made. For example, stroking it to 1.5 and spending more money on things like head work, and making sure the engine is tuned properly, plus how often you really get on in combined with where the boost comes on all make a difference.
