Has anyone here compared the 2 setups on the same car?

Application is a BB/727 '72 Duster street/strip car. Approx weight 3400. No doubt most of that weight's on the nose, even with aluminum heads, intake & radiator and 'glass hood.
Seems the "default" spring is always the 002/003 (rated 160#/in for 3000# stick cars per MP), but I'm wondering if the 456/457 setup (125#/in, 3400# auto cars) wouldn't be the better choice.
I'm hip to the torsion-bar adjustment, but also question static ride height and ride.
CalTrac/ladder bar/4-link stuff isn't an option at this point.

I run the 3400 # springs. 71 Demon,440/727/Dana 60. Aluminum heads,radiator,water pump and housing,glass hood.

My car will hook in a car wash.I have Rancho shocks on the rear and Calverts on the front.

The SS/AA Hemi cars used the 3000# springs,so it is something to think about.

I'm thinking the 456/457 where designed for SB motors in the 1967 to 1976 A bodies, the 002/003 where designed for the original 1968 SS Hemi A bodies, they work very well in all the other A bodies with BB and Hemi motors, stick or automatic trannys
My 1971 Duster with a 400 block stroker motor with all the aluminum parts your using had 49 3/4 % weight on the rear tires and 50 1/4 % on the front tires with me in it, it weighed 3450 lbs with me in it ready to race with a Unlimited race weight lift off hood with a hemi scoop on it and a unlimited Fibreglas front bumper
I did slide the motor back one inch on the stock tranny mount to enhance weight distribution and I slid the rear end forward one inch as well as stretching the rear wheel wells five inches, three on the front side and two inches on the rear side
I didn't run leaf spring on that car( it had ladder bars with coil overs and a rear track bar) but I have raced a BB 440 powered 1969 Dart with the 002/003 springs clamped on the front half on both sides only on it and a pair of the old Imperial 50-50% long shocks, it would 60 Ft. in the low 1.50s with 3.91 gears and 10.5x29x15 inch bias ply slicks on 8.5 inch wide wheels in the rear, nothing wrong with those springs at all

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.

Thanks for the responses; seems either will work. Obviously there must be some difference between them. Still wondering about height (arch) & ride quality differences.
This will be a footbrake car at the track; has a 3500-stall converter (haven't verified actual stall yet), 3.91s (may change to 3.55s) and it'll be short-shifted to keep it above 11.50s...until the greed sets in... After the spring switch comes a tire decision, pretty tight with 275s, even with springs moved in 3/4". No room for additional clamps at the front sections. I don't think it'll hit the tire like a 4-speed or my 10-sec, 6,000-stall converter car does, but I could be wrong, as this thing makes gobs of torque.

I had 002/003 rear springs on a 65 SB dart (came to me that way as a roller) & it rode nice and tight when done. Daily driver, not raced.

The height difference ( camber in my earlier post ) - 002/003 will make the car lower since it has less arch due to the thicker main leaf .

Like my earlier post - 3100 lb car with a 4 speed went 10 teens in 1971 on 12" tire. And the car had no where near 50/50 weight distribution.

Ride quality - you need to buy and drive a C Body for that.