Opinions on heads please?

Moper is it really necessary to do a lot of port work to get 450HP? All the dyno tests I have seen of the 360/380HP crate motors have these engines easily reaching 420HP with just careful timing and jetting. They are built with magnum heads and 1.92/1.62 valves.

I would think a set of magnum heads (easily picked up for $300 or less) with a good multi angle valve job and bowl blending would support 450HP or a set of the magnum R/T's right out of the box would do it too.