I have a 82 Z28 with a 4 barrel 305. I was wondering if it would be worth the time to advance my timing. I heard of all these high performance people doing timing advances, and i want to know if it really helps. If it does, how many horses do you think this step would make?? If it does work, how do i advance timing anyways??

It isnt worth the chance you are taking by advancing to much you may gain a little but nothing worth taking a chance. You advance the timing by moving the Distributor