Are you sure its a Dana, mid seventies chevys as far as I have ever seen had 14 bolt coprate rears, ( AAM American Axle Manafacturing ).
You can bolt up a regular rim on a dual truck, 8 lug is 8 lug except the newer stuff which is metric, Ford Super Dutys etc., & older Dodges have a smaller hub hole.
Is this parts truck a cab and chassis or a dually? The duallies have the same width rear axle housing as the single wheel pickup. A cab and chassis axle housing is between 2" & 3" narrower than a pickup. The spring perches will fit but the track width is narrower.