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The 40.5 center-to-center on the spring perches makes it a 1-ton, not a 3/4 (they were 42.5", IIRC.)
Your ideal donor for a 1/2 ton is a 3/4 ton 4WD truck (either Burb or square body pickup.)
The 3/4 has the right spring perch spacing, and the 4WD has the right shock mounts. 2WD's you might have to cut & reweld the shock mount on one or both sides (though that's easier than doing the spring perches IMO.)