Dual Exhaust System Recommendations ?

Same deal here on my '74, stock long block 318 (With a bit of water in the exhaust, LOL!) Hooker headers into the Jegs true dual exhaust and there mufflers;


[ame="http://www.youtube.com/watch?v=pOYMlTTecTU&feature=channel"]74 Duster Exhaust - YouTube[/ame]