R in Boreham

Gentlemen, both of you. Thank you very much

Good Evening I have browsed this forum for a while and have just registered. I hope to call on some knowledge if possible from anyone, I own a 2002 S Type R that I've had for 4 years. A fantastic car and one that I hope to keep forever. I have run it as normal until the Mrs hit a bollard and took 2 doors out of action in the process. I then decided that I would take it off the road and give it some TLC. I am starting with the engine before any cosmetics, it is out of the car and being rebuilt with new chains etc. I am keen to maximise any potential upgrade in power whilst the engine is out, I have been told an updated supercharger pulley and twin screw is possible. Are there any other combinations you can suggest along with a remap that I can do before re installation? I am looking for 500+ HP Thanks in advance Steve