Iron Ram heads from Hughes
But do Eddy's perform better? Probably not. Their flow numbers are nearly identical and according to Hughes site the Iron Rams respond real well to porting. Generally speaking iron heads make more power given identical flow numbers because iron doesn't disapate heat like aluminum heads do and heat is power.
You hear this a lot, but I've never seen it substantiated anyplace. I do recall one magazine tested some World products heads in iron and aluminum and made nearly identical power with both. Also, there is more to making power than flow numbers.
It should be noted that there is almost no markup available in Edelbrock heads (with end of year price increase, typical wholesale price is $1325/pair for the Eddie Magnums), whereas there is profit margin in these iron heads, so a lot of vendors are going to push them.
You can buy those heads on Ebay (with springs) for less money if you do a search for Monster Magnum heads, and you can probably get them with the LA intake pattern for the same price.
If I were going to spend the same or similar amount of money either way, I'd get the aluminum heads. 50 lbs off the front of the car is hard to ignore, especially if you race at all. And if you're talking about porting, I'd way rather port aluminum than iron.
The Edelbrock Magnum heads should not be ignored as an option.
Steve