383 power?

I am currently building a 383 for my 70 duster and was wondering what sort of power i will be making. I plan on going with the aerohead 906 cast heads, .509 lift cam, edelbrock rpm intake, and edelbrock 750 carb. I am only 17 and on a budget and was wondering about piston selection also. I will also be running tti headers. Would it be worth the few extra bucks to go with the stealth alluminum heads over the factory 906 heads?