More on the 55 here:
Pic of them both:
Dave gave me a bunch of his old pictures and these of the 58 were in them:
It appears the 58 had a bit more hot rod attitude early on and Dave got the bug to restore it to a more "stock" look.
It looks like maybe those wheels and tires ended up on my dads 55?
Also note in the pic of the two Corvettes together the 58 has skinny whites and below it has wide whites.
It was in the Dallas Autorama in the early 70's it what appears to be a Corvette display: