At 9.2 actual measured CR, my .030 over 440 with iron heads ran mid-12's at 108 in my 4260# Charger. And it drank 87 octane pump fuel.
Alum heads will flow more and make more power. You just have to decide what your goal is for the car and build the motor accordingly. I thought mine did well and was happy with it for what it was. Put that motor in a car that weighs a 1000# less and you can see it would be fairly stout.