i've used espo 6 leaf springs on numerous cars and really liked them.. on our current 70 dard we used the eaton springs.. wanted something with more spring rate so we went with a set for a 383 dart. real happy with those too. the eatons are more expensive.

the woman at espo knows here stuff ans they have great customer service. https://www.springsnthings.com/

if you want the eaton then give pete a call @ https://bergmanautocraft.com/ and he will set ya up with what you need.