DS for the bigger arch. Try to get the other leafs tested and make a similar "pack" for each side.
GM Changed the upper control arm mounting Arms ( steering) and the rear leafs to accommodate new Road crowns, and Radial tires.
There was no longer a need for a difference in springs as alignment and radials could make up for it.
I always put on 1973 ( single part number) 4 leaf , around 126 lbs springs. This allows some movement, even with the rubbers in the eye and shackles.
Firebirds are always heavier on the DS, so Big arch there.
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