The AMT 1971 Charger is correct. Another good solution would be to find one of the Wal-Mart '74 Road Runners, as that has the correct catalytic-converter exhaust molded in. The rest of the underside and engine are direct-fits, unless you want a 318/360, in which case you'll need a 1971 Duster for a really nice LA-Block (from what I'm told,) but there are other options out there, too.
As to the interior, I'm not sure what's right, aside from the Fury's.
I wish you well in this. This is will be an arduous undertaking, with great reward if it's successful.
Charlie Larkin