Until you've completed the engine upgrades, I wouldn't order any high stall converters. The little daily driven 318 will work just fine and dandy with a stock converter even with the Edelbrock, etc. you appear to have on it now. Changing the engine specs with headers, camshaft and head change will alter things. Any performance converter you purchase now for your present setup may be a dog once you've done the upgrades you're planning on.