There are better converters out there today. You will most likely need a converter with more stall speed that couples well. Give the converter a try if it is fresh and thats what ya got. Mine was a tight converter with a bang lockup.
Also you should have a billet stator at the power level you are going to be running. If you plan on sled pulling or drag racing it would be wise to go with a billet stator converter from Georend or Suncoast. Hit up Mike L and he will steer you in the right direction.