rear leafs 68 barracuda

I know that the offset spring hangers move the axle forward around 1/4'' compared to the factory hanger. My next measurement would be the front half of the spring to the center bolt. The new springs may have a shorter front half compared to the origionals. Id say your shocks are to short and should be replaced with a longer set. Will they "pop out", probably not, but its not a good combo. Mancini not knowing the answer, or better yet, giving a s@#t doesnt surprise me.