Boring a small block adds around 5-6 cubes per .030 over. So, if you are making 1 hp per cube (which is a little higher than most street motors), that will be 5-6 hp per overbore. That may be a lot to a ricer considering most of their performance parts under $300 only add up in incriments of less than 5hp, but in the muscle car world, it's nothing to be concerned about, especially, if you're bracket racing.