Advice - Torque Converter or Gear

Keep your 3:55 gears and go the torque converter route. The guys already gave you the best links to these.

X2 on keeping the gear. As far as Continental, I have known the owner Kris Abrahamson for over 25 years and he is a class act and builds one of the finest converters out there. You can't go wrong with any of the companies named above also.