The Impala's had the Corvette motor, but with iron heads instead of Aluminum which makes for most of the lost hp. They are fast though. My friend has a 9C1 Cop car with the LT1 and we put a Camaro 6-speed in last year. When I had my 300hp Mustang, he wasn't far behind. Once he installs his 4.10's and gets the 2.73's out, it will definitly help to get that hog of a car moving. I think an Impala is the only Chevy I'd ever think of owning.
