It is a 'body on frame' platform. Surprisingly, the frame with minor variations dates back to 1977.Yep, I'd fix it.
I see nothing in those photos that would scare me away. Some time spent on a frame machine would do wonders...
Is the impala a full frame car? I haven't seen one in 15 years.
I'm thinking it was. And as far as i recall there was only 3 or 4 years of this model. I worked at a GMC Cadillac lot in 9t when the last Fleetwood models came out. 96 was the last year for the big rear drive sedns.