6.4l budget build….kind of

My plan is to start with these and go headers once I’m disappointed with the performance, hahaha. Seriously though picked them up cheap off marketplace to get me started.
My guess is that you will suffer a little bit of horsepower on the top end of your RPM range... how often you will be "up there"? These "manifolds" look like an easy answer to a tight-fitting engine compartment