The coolant flow don't change directions. Just the way the water pump does.
The pump can turn either way, as long as the pump vanes face the right direction it works fine. The majority of the early to mid 90's bracket systems are all reverse direction. However, don't get it confused with reverse flow cooling such as what came on LT1 and LS1 engines as these are completely different and won't interchange on to generation 1 small blocks.