Does anyone search these days?
Plenty of GC8's rolling around with 250-300hp with mod lists on here. (185 - 223kW)
Block strengthening at 150kW? LOL go see someone who knows what they are doing.
ECU as stated every day this week... PowerFC, Vipec, Autronic, Motec or whatever your tuner uses and gets good results out of. No point rocking up with a Haltech if your tuner has never used one before imo.