Whoever said stroker kit is kidding himself!

You most certainly don't need to stroke the thing to get those sort of power levels. To get there you are only just on the high side of a standard rebuild and a T28 turbo. with appropriate support in fuel and ecu. For reliability you might want to get some forged pistons, good bearings and rings but that would be all you'd need to do internally. Bolt on a GT28RS turbo with the 0.86 rear housing and some 550cc injectors will get you there. Whether you go for an aftermarket ecu or get the thing chipped makes no difference. I hear people like Dr Drift can tune in real time these days so it's just as good.

A simple combo like that will easily get you to 250rwhp reliably.