i have made my decision to swap my 6.2 for a 400sbc. mainly for power reasons. mine is not a daily driver so the mileage isnt a big deal and i have a good running 400. i made the decision yesterday when towing a small military trailer, power sucks!!! my plan is swapping the 400 in this winter. i'm curious what improvements can/should be made to the 400 when doing the swap. i'm planning on a holley truck avenger for fuel, but what are some other upgrades ? are headers worth it? what about ignition upgrades? anything else?... and i dont have to smog it!!