I have 2.45 gears in my 73 Charger with a 400 and in 3rd gear it easily cruises at 65-80mph and will pull up any hill easily without needing to downshift or give it much more throttle. My 400 has stock pistons, a mild cam, and a 670cfm 4bbl so I would think a 440 in a C-body would pull about as good as my 400 B-body.