Yup, you will need an 833 trans from an a-body or newer overdrive from a f-body Plymouth Volare or Dodge Aspen.
Your exhaust headers or manifolds will be another thing to sort out, gonna be tight unless you go fenderwall's headers.....63-66 A-body cars are different than the 67-76 models. Brewers Performance is a great place to get all your 4-speed stuff, they have a great website and tech support staff, they can get you moving :glasses7:
