Headers for my 318

I am running a stock 318 with a 2 barrel, I think removing the engine for a cam is above my capabilities but adding dual exhaust to my manifolds seems doable. Would that along with a 4 barrel and new intake give my engine a little more "umph"? So to speak haha. Is installing dual exhaust come with any problems I should know about before attempting? Its a four door dart and I am tired of it looking sounding and driving like a grandmothers Sunday car.

you dont have to remove the engine to put a cam in it. i put a set of cheap *** long tube hooker headers on and an edelbrock intake and 1406 carb and its got a lot more nuts even with a stock 727 trans and 291 gears.