Advice needed...

I would get something close to the 284/484 cam , maybe a dual pattern vodoo or the comp xe line ?
I know there are better cams, but I had a 284/484 in my 70 340 4speed duster , nothing special 040 forged pistons , stock cr stainless valves , headers , intake, ignition , 750 carb with 4:56 gears. It pulled really hard !!
I had 3;91 gears before .
I would defineately put the 340 in the Dart !