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I think the top for a highly developed race twinspark is in the 250hp range. Jon Norman and Dino Cresintini built GT3 cars for SCCA in the 90's for that.
The hp cut off changes if you are trying to use pump gas though. If you are using pump gas, programmable fuel injection and programmable ignition I would think the way to get 200+hp would be to concentrate on obtaining very high RPM with maybe 11.5 to 1 compression. Titanium rods will drop the rotating mass by 50% over the stock rods. Cosworth already makes a nice light race piston designed for the GT3 cars, so you could ask them to drop the compression a bit and concentrate on lightness. 5 main crank oiling and a high volumn oil pump would be a must. We have a set of billet aluminum main caps and integrated billet aluminum girdle to help keep the crank straight while spinning at 8000rpm and Jim Steck make a fine set of stainless headers. The cam and injection for this set up would be somewhat uncharted waters though as well as valve size and head work. The challange being making it so it has a flatter torque curve through the rev range to make it more driveable. I am guessing this is going to cost well over $10K before you are done but will still be a pretty reliable motor after it is sorted.
In stock form the twinspark makes a wonderful power curve. Why not just strap a 30hp nitrous w/fuel injection system in for about $1000? I don't think any motor modifications would be needed at this low level of boost and I think the bottles will actually last for a decent amount of time. The system could be manually armed but then set to automatically spray at some throttle setting.
My .02
Andy
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