Cool Impala, Nbent, while all my friends back in the 60's were all crazy about the Chevy IIs, Chevelles and later the Camaro craze, I was always most fond of the big 'ol Impala size cars and I really liked 4 door hardtops like this! Depending on your goals with this car, and how much you have invested, It may not hurt to try to make it fire. Pull the plugs and turn it over by hand a bunch of times if it don't thunk to a stop, there's no bolts or nuts dropped down the intake, and slop in the timing chain can be determined at the same time.
It can be driven the way it looks, clean it up put seat covers on it and work on it as you drive it. Too many people, including me, start taking everything apart right away then there they sit overwhelmed, I have one I took apart, and one I decided to just make it run and work on it as I go. Guess which one is more fun right now----and most affordable too.
Just my opinion, If it was something like Barrett-Jackson material, sure take it apart and do everything to the meticulous extreme, but this car could be a blast just to have as a driver.
i plan on driving it, the only reason for taking the intake manifold off is because it has sat for many years without a carb, but i found one for it today.