Basically the choice is 4 ways:
1) Leave the engine as it is and accept that i will be down on power on the rest of the guys in Time Attack next year. Use my time, effort and money to get the car lighter and me driving better and forget the chase for power.
This may be enforced on me budget wise but is the least attractive option for obvious reasons.
2) Change the turbo for something a little bigger. This will mean that I can run it more within its efficient range and it will cause less heat in the engine. Power will be slightly higher this way but the flip side of the efficiency is that it should be less stressed.
Turbo on the top of the list now is the FP Green and will get me to the happy side of 400 and possibly 450 lb/ft torque without affecting the driveability of the car at the lower end.
This really appeals as a make-shift but I feel that I would have to budget for a new engine anyway as I would be pushing my luck on this.
3) Get a spare EJ257 and change pistons for forged items. (edit to say rods aswell) This can be done relatively cheaply and would be able to simply swap engines leaving me with my old short block to sell on and recoup some cash.
Again with the FP green, this should give me more potential from it and should get it to 450 bhp and nearly 500 lb/ft. If I went with option 2 for now, the turbo could be swapped over to the new setup when the engine is built and ready to swap.
4) Bite the bullet and accept that the next step is going to be expensive and do the job properly. At present, the favourite on this route is a Brian Crower 2.71 but with a higher rev limit too so enabling a massive potential of 600 + bhp but with an even greater wall of torque to help with daily driving duties. (it will be de-tuned for road work)
Obviously money is a restriction but want views from others please

Clutch and other considerations will be taken care of anyway and will go for the most future proof.