Aluminum or Cast Iron-Which is Better

[357windsor]

I'm debating on what type of heads to get for my motor. I know aluminum is lighter and they dissapate heat better. The heads will be going on a 13.5:1 357w in a 82 Mustang w/ a c4 and 4,000 stall cinverter. I'll be running 3:73 or 4:10 for rear gears and a 28x9 or 28x10 slick. Any help will be appreciated!