Gasket Match ? Block to Timing Cover

Changing back to a stock type water pump helped my engine temp come down. But I still wasn't satisfied with the engine temp in traffic. One day I talked to a guy who races stock cars. He told me all the racers use a product called "Water Wetter." Said it will keep my engine cooler. Now, during the summer months I run "Water Wetter." I run about a gallon or so of anti freeze (just to keep corrosion out) and the rest plain ol' water. Plus one bottle of "Water Wetter." My engine temp stays right around 180 degrees even on the hottest days.. Before using this product my engine temp would reach 210 degrees. I also run a 340 stroker and want it to continue to live. Heat kills.