It's an Avro Lancastrian developed from the WWII Lancaster bomber. https://en.wikipedia.org/wiki/Avro_Lancastrian
Ugly, but still not as ugly as some Nopars in the early 60's No hate mail please. opinions are just like butt-holes, everybody has one That is mine
'58 Impalas - loved them since I was 11 & got to ride in new demos the neighbor drove home .... The gal standing next to the white convert is going to be glad she has AAA .... Some pics were posted here years ago - thanks !
Level - Air - GM field tested it on the public. It could have used more research. You'd wake up to a car dropped on it's hands & knees because the air system failed. Most were replaced with springs right away.
From a friend's dad's shop in Phoenix 1961. He'd worked for GM Hydra-matic during the war, & knew all the trick stuff many years before there was a market for it.