Leaf spring ID please!

I took these off a 68 Barracuda parts car I purchased, and cannot cross reference the part number. They are 5 leaf, and both right and left have the identical markings and part number.
I know the car was used for drag racing at some point, and had a big block as the inner fenders were cut for headers. Thinking of putting new bushings in them and using on my car, but would like to know what I have first.
Any help would be greatly appreciated.

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