Not Ranked
If you just want (& can afford) aluminum, get an aluminum block. If it were me I would run the block & pistons you already have. Deck the block & on with the build. Have the block drilled for cross bolt mains & you are all set for a monster Iron block stroker.
I think Ironman would say aluminum is for whimps........ 
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Mick
(Of The Troops & For The Troops)
Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body; but rather a skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, WHAT A RIDE!"
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