Mike
I knew it had to be around there!
Is ths the Radiator shop (Alen) now as well as the Autobody shop next to it.When you mentioned Ogden,that is the first area I figured on.
I know of this Garage you speak of from D&M.I was told of that black LS-6 Convertible as well.I was tempted to buy,but the price was out of reach.
I was cruising the Lombard/Downers Grove areas back then in my Chevelle SS.But I don't recall your car.
Days gone by my friend.