I noticed a lot of people are looking at Vortec heads for their sbc builds. Pro Topline offers a price equivalent (“906” replacement) head that works better than the stock head. The heads will accept camshafts w/ lifts in excess of .470 without any cutting and comes standard w/screw in studs. They flow better out of the box than the Vortecs and with a mild bowl blend will sustain 450 hp easily. These heads offer a significant price/performance advantage to putting money into stock heads. (I am not affiliated) Joe Sherman is using these heads on his crate (Goodwrench short block (cast), “906” heads (bowl blend), mild hyd flat, demon carb) engines and is making in excess of 450 hp, so they are capable pieces.
Hope this helps,