IMO, there are several serious advantages to the AL.
There is a proper exhaust port.
You can fill up the EGR stuff, but while the gives shape, it does nothing strenght wise, and all that extra metal just reduces the fluid volume.
One a carbon layer forms in the combustion chamber, it's moot about heat transfer out of the combustion chamber, IMO.
Being able to *wick* heat away from the exhaust guides, and seats, is an advantage the AL enjoys.
If you get the 14 bolt heads, then you'll have all you'll ever need, even when you do that stage motor <G>.