itll make power, but itll make you prone to detonation even with the timing retarded. I would talk to a reputable honda tuner before going through with that.
high over lap (like the crower 404s offer) is not a good thing on a turbo engine. It allows the back pressure from the turbo to build up in the combustion chamber causing higher temps and makes the mixture more prone to predetonate (the leading cause of blown rods).