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1. 600 cfm should be adequate.
2. price, also iron retains more heat and so will make more hp (all else being equal).
3. aluminum dissapates heat better than iron, so will tolerate more compression before detonation occurs.
4. likely because everyone knows about Holley and BG, the 4100 is more obscure?
5. not completely clear on your question here, as a reverse dome I would interperate as a dished piston? this with a std chamber might yield lower cr than the small chamber/flat top model. anyway, small chamber and lots of quench area is the way to go if looking for hp.
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