1970 Convertible springs

I am trying to find good springs to use in my 1970 Convertible Skylark. I am replacing the original 350 with AC for a 455 and removing the AC. I think the overall weight change is nominal. Does anyone have any recommendations for front springs for my situation? I do not want a rock hopper, but I don't want a funny car either. Has anyone heard of springs by a manufacturer in Illinois called Elgin? I spoke to a vendor at the Spring Carlisle show who was hyping them to me, but I did not want to bite until I got some info from my Buick comrades. As for the rear, does anyone recommend putting heavy duty or wagon springs into the same car? The old ones were pretty spindly, and needed air shocks to pick up the rear. I do not want to change ride height at all. Thanks
 
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