How many leaf springs?

Guys i just got back my leafs back from the blaster and my rebuild kit showed up today so i started playing! Turns out i think i have to many springs 8 per side.How many should i have? rear suspension is out of a 68 barracuda so I'm told but it sits under a 70 dart! There are some numbers on them that i have no idea what they mean(see pics). I'm not looking for drag car stance but maybe a little higher the original. Thanks guys!

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