I have the 67 with I6 and 3speed i plan on keeping the motor and tranny . I'm upgrading to front discs but he rear of the car is sagging what and where do i get new rear leaf springs! How do i determan what spring weight i need to get it back to level?

Thanks Ron

 

Just get some replacements from one of the many Mustang houses like Mustangs Plus, Larry's T-Bird and Mustang, etc.

The '67's look like they have saggy butts when stock, anyway, so you may want to think about something with a little more arc if you want the agressive rake.