Actually you still can benefit from cam gears on your stock cams. Back in the days when there weren't any reliable bigger cams, cam gears were the only way to get power out of this area, aside from headwork. If you can, an ITR cam (preferably a '00 model to do the bigger profile) will yield you some good power throughout the powerband. An average gain is in the neighborhood of 7-10hp sans cam gear tuning.