Someone school me on converter/pump relationship please!

Didn't mean to make it sound like this is just a street car. I was meaning that it will see the streets here and there. I talked to a guy over at Continental and he suggested going with a 9" converter for my combo. After talking with my engine guy, he is suggesting a good converter should be on the horizon. One scenario he had years back, I guess he was running a car 11.70's with a cheap converter. He decided to upgrade to a high dollar unit and changed nothing else about the car and ran 11.2's after the converter change alone. He says a converter is one of those things that you really do get what you pay for. So I'm out with Hughes for now. We're going to hunt down a good converter for this car.