you could try a set of leaves and hangers from a newer truck about the same size/weight. I have seen a few with s10 or ford ranger rear leaves and hangers/shackles. the frame mounted hanger brackets are available through dorman I believe.
stock spring packs are a bit heavy compared to newer trucks. you could remove a few leaves and go from there. what is the purpose for the truck, driver only or possibly have a load but really just groceries?
less leaves with an overload leaf at the bottom for a little protection in case the grocery store has a deal on case lots, lol. that would give a smoother ride unless you add enough weight to contact the overload.
you could take a few leaves out and grab one of the thicker, longer leaves from a newer truck's spring pack that uses the overload leaf at the bottom. the theory is the regular leaves are arched more than the thick one at the bottom so during everyday use the springs don't contact the overload. if circumstances change and the regular spring pack contacts the overload leaf the the pack flattens out against the overload as the weight is added. that gives the ability to carry more weight but have a smooth ride under normal driving. also gives ability to have a gradual "application" of the overload as more weight is added.
if removing leaves, remove every second one to make a more progressive pack and also to take strain off the upper leaves. a larger difference in length between leaves that touch each other means the upper of the 2 can bend or break under a load.
ensure to have decent suspension snubbers in place. I like the beehive snubbers like the S10 used.
https://www.torklift.com/blog/entry/...our-suspension
https://www.amazon.ca/Dorman-523-049...93664347&psc=1