I've seen a few that set up high...but that's way too much to correct with spring hangers and lowering blocks. It may be cheaper to check into the HD springs...

wow that's high! the shackle is pointing in the wrong direction. should go like this \ relative to the rear

The 002 and 003 SS spring would be correct for nostalga type drag racing. They are designed to transfer the weight on launch onto the rear - especially right rear. On launch, the rear body will rise a little and the front a little more. They will need to be used something like 9" slicks and put the snubber up against the floor. /6 t-bars, 90/10 front shocks will also help and all period correct.

For stock replacement, the factory parts and shop books listed different springs for different combos. Something like this:
1969 A-body leaf springs
6 170 3004 580
6 225 3004 581
6 225 B-HT 3004 582
6 225 B-FB,C 3004 585
8 273 Val, Da 3004 583
8 318/340 V,L 3004 584 new
8 318/340 B 3004 588 new
8 383 B,L 2808 677
HD ex. 383 2808 532
HD 383 2808 678

Leaf packs varied from as few as 4 leaves to as many as 6 on both sides.
Stengel Bros carries a good selection (made by Stanley in the US) and you can drill down to see the specs of the ones they repop. However, if you're buying them and expect them to be visually correct, find out if the interleaves and clamps are different style than original. So for most correct looking, the clamps might have to be changed out.
http://www.stengelbros.net/Plymouth-Leaf-Springs_c_226.html
http://www.stengelbros.net/Dodge-Passenger-Car-Leaf-Springs_c_194.html

Initially that was one of the reasons I went to the longer B Body hangers since they were headed in the wrong direction. Later replaced the shackles to sliders.

it almost looks like you have truck springs on there! maybe that's what 'heavy-duty' relates to? is it possible to remove a leaf?

hi,is this cuda finished? bumpers, full interior,full fuel tank, sparetire, jack, all window glass? both front spring hanger bolts NOT tightened until car on ground and loaded? try another pic with a 225lbs buddy sitting in trunk with loose front spring bolts and lets see how it sits. ron

back glass is not in the car. rear bumper doesn't weigh much. 240 pounds hanging on the rear of the car makes very little difference.

The interior, gas tank spare and jack,and all the glass is in. Still sets way too high. I'm going to remove the mopar performance springs and put my stock original springs back under it.

Keep removing leafs until it sits right, over time if it sags add back.