Aluminum heads are every bit as reliable as iron heads. There are guys putting serious boost to 23* aluminum heads without problems. But, as you said, they are more expensive.
Dart makes some good iron heads. They have 180cc and 200cc intake runners and I believe have 2.05 intake valves. I'm sure they're available in different chamber sizes as well.
What are you doing for a cam? Flat tappet hydraulic or something more aggressive?
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