Call edge racing converters. They will set you up with a perfect one for your combo. They are on the pricey side, but you get what you pay for with converters. www.edgeracingconverters.com
Different company's will call for different size stalls. With the stock cam edge will sell you a 3000 stall. With Precision Ind. a 2400 stall is perfect for a stock cammed 5.0. I have a 2800 Precision and it's a hair too big. These are the only 2 company's I would deal with for a stall converter. (For a 5.0)