Use the 002/003 in your application. We used them in both manual and auto applications 40 + years ago - with the cast iron head Hemi in SS/A & SS/AA NHRA. They have less chamber than the S/S spring, work everywhere, have thicker main leafs.

Obviously you don't want to use either if you are going to go to Slide-A-Links or Calverts.
Plus the quality on the S/S springs have gone to hell from what I keep hearing.