b16b cams are more aggressive than b16a cams. They will put more stress on your valves, valve springs and retainers, so upgrading those components will not necessarily net you more power but will ensure longevity and durability. Those cams are still relatively mild compared to some aftermarket NA cams so don't think your motor is going to blow up if you don't do something right now.
If you're looking for more power you need more compression. The aggressiveness of the cams is designed for high revs and more air. So basically you need to upgrade the block internals to increase your compression ratio, which in turn will give you more power. The higher reving powerband brings you back to problem A (durability), so you will want to beef up the motor with bearings, rod bolts, and head studs.
