hi there looking for help,i`ve got a 425 engine& in need of a manual transmission which one would be best to handle this engine .ty

 

The first question is, is your crank drilled for a pilot bearing?

As for trans, you need something capable of handling 500 ft-lbs. That leaves out most readily available (or affordable) manual transmissions. Think TKO500, T56, or Muncie.