Leaf Packs

[Facetime]

I have a 70 K5 that has some serious sag in the rear springs. I was thinking about having them re-arched but have heard mixed reviews about that. Not necessarily wanting to fork out the cache for new ones. I was thinking about trying to pull some from a vehicle in our local yard. My question, is there any problem with putting 3/4 ton spring packs if I can find them? My plan is to just measure end to end and then looking at the height difference and go and try to find some that match. Any thing else I need to consider? Thanks in advance.