360-383 A-debate...max builds need not apply.

Another thing to consider is longevity & reliability. Hard to beat cast iron. Should the engine over heat with CI heads, good chance the heads will not be damaged. Overheating alum heads can soften the heat treating & then they blow head gaskets after that....unless they are re-heat treated.
Over the long term, the head gaskets will 'wear out' with alum heads/iron block. Every time the heads heat up, they slide over the head gasket due to the higher expansion rate; then they slide back the other way when the engine cools down. Eventually enough wear occurs that clamping force is lost & the gasket breaches. This was why TTY bolts were developed for alum heads. The extra 'springiness' these bolts have help to compensate for the lost clamping force. I don't they make TTY fasteners for our old stuff.
Then there is the corrosion factor with alum heads.
So if you want to have trouble free operation for many years, there is a lot to be said for CI heads IF they provide the reqd performance level.