74 duster need some advice mechanical or vacuum secondaries

im puttin together a 74 duster an having trouble deciding which carb to go with it . the motor is a 360 bored .40 over, ported polished heads, flat top pistons and it has a super comp cam. (my builder said it would be a minimum 400hp) that everything i know about the motor the trans is stock 727 3spd i was planning on using a holley 4150 750 dp but i will be using the car as a daily driver and am not sure if i need to go with a smaller carb or a vaccuum secondary carb ?? i have zero experience with all of this and would appreciate any advice ! thanks :sign3: