'Specially considering that the Vortec heads are the BEST-flowing OEM small-block heads this side of the LT1 (and some folks think the Vortec heads are better than the LT1 heads.)
You are correct, I was mistaken about the vortec heads. Though they don’t even compare with something like stock 706 truck heads, the vortec are the best iron Chevy heads you can get. Still they are only able to support around 600-700hp at the flywheel before they become a restriction.