Need head suggestion

[70stroker]

I have a 454 bbc with a 177 cid wieand blower on it. pretty much stock bottom end, .550 565 cam. headers thru 3 inch dual exshaust. right now i have a set of stock heads. motor runs great so i dont want to go diggin in the bottom end. My question to you is what heads would get me more power. Like i said the motor runs awesome. But as most of you a great running motor is never enough. we always want more power. Is there a decent iron head or must i go aluminum. Im thinkin about 2k for a set, give or take a few hundred. suggestions are appreciated and what im looking for.