Just have the block bored .030(if it needs to be bored at all). These blocks have plenty of meat left at .030. Many have bored them to .040. After that they start getting a little thin walled and the structural integrity becomes questionable(water jackets etc). Your parts list looks good btw. I would recommend looking into a pro m meter instead of a BBK though. The pro m is a higher quality piece but the BBK will work. I would just refurbish the rods and crank and grab those Pistons. When ordering your heads get the smallest cc chamber you can to increase the compression like previously stated. You will also need a steeper ring&opinion gear set. Most people like a 3.73 ratio with the automatic trans. If you do the 306 w/TFS topend kit-modified AOD-3.73 rear you will have a very fun car that will last a very long time.