78 heavy half ton

[Straight six]

So I was finally able to track down more info on my c15. The paper work says its a heavy half ton. So I'm wondering if I can use 1/2 and 3/4 ton front and rear suspension shocks, leaf springs, ect. I think it's got 8 leafs in rear really would like to use the 4 or 6 leafs there a little cheaper and if all of it would be a bolt in installation. And now I'm wondering what the other differences would be if any or does it just mean the suspension is different?
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