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. That's why when you run an aluminum head you have to run higher compression to make the same power. The only advantage of the Eddy's I can see is their lighter and aluminum heads do look cool.
I had the money to buy either when I bought my heads back in August and contemplated both and went with the Iron Rams just because it looked to me like I can make the same power with them for $600 less. There is only $350-400 dollar diff in the purchase price but the valve gear is much cheaper for the Iron ram Magnum style head. A good set of rocker arms for a LA style head will cost at least $350 minimum and the whole package, rockers, pushrods, guide plates, studs and adjusters for the Magnum heads only sells for $350 from Hughes.
It's just my opinion but they look to be a super good deal to me.
I hope to have my 408 together by spring and when I do i'll have it dyno'ed and post the numbers.