Well so far it seems it will fit almost perfect and since the Impala/Caprice were also rear filler necks it lines up really good. The only thing is that you either let it hang a little lower than the stock tank or your cut a hole in the trunk for the top of the pump to stick up a little. I'm going to cut a hole and make a raised box door for the sake of ease if I need to change the pump later down the road.
