No, you cannot turn a 1984 Camaro's 305 small-block Chevy into a 350 simply by boring it out and adding new pistons and rings. While boring the cylinder block *increases* the displacement, a 305 block's bore size has a physical limit before the cylinder walls become too thin and weaken the block, making it unsafe. A 305 block simply cannot be safely bored out to the larger bore diameter needed for a 350. They have different bore and stroke dimensions. You would need a different block entirely (a 350 block).
Even if you *could* bore it out enough, the 305 heads are not suitable for a 350. They have smaller ports and combustion chambers that will significantly restrict airflow and power output with the larger displacement. You'd need 350 heads, and potentially other components as well, for optimal performance.
