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I have a TH350 and 350 with heavy porting on 305 heads, 231°/231° @ .050, and a 2500 stall Hughes converter. The torque converter is perfect for this engine. With the stock converter, it struggled to stay idling in gear. Now it behaves much like stock, unless you punch the gas and then it flares up to 2500 and pulls from there. If you are on and off the throttle in traffic, it feels a little sloppy, but that's the nature of a relatively cheap stall converter.