help with 440 modifications

i have a 78 440 in my 73 duster, it has been rebuilt to stock spec's i want to try to get to 400hp (or close) can i do this with bolt on parts. i did not rebuild it myself i was told it was stock except for .30 over and it had heads off a 72 charger. what do you guys think,

intake
carb
cam, suggestions

it is a dayly driver with power brakes and 373's out back (closest freeway is 50 miles away)