hi im having my engine rebuilt after the heater matrix pipe burst and fucked it.

im having cosworth conrod pistons n rings oversized at 85.5m plus heavy duty bottom end head rebuilt and 4 layer head gasket. i have a decat exhaust bluefin remap and forged actuator. what sort of bhp should i reach with the above? and what mods should i go for next to improve bhp? thanks kieran