340 Aluminum Head, Rocker Arm Upgrade

No such beast as an out of the box, bolt on head. There are threads about this all over the site. Just forget it. Whichever heads you settle on, have them checked out by a competent machine shop, as none are perfect, ready to bolt on. It simply doesn't exist. That said, the Trick Flow heads are probably the best and closest, but I still advise having them gone through as well. 65cc chambers are a bit smaller than most stock open chamber small block heads. They normally cc around 70 or so. For rocker arms, I would look at the Comp Pro Magnums.