The original question was would you rather have a 30 year-old iron "427" (not FE), or a new aluminum 427. Since we know "iron" 427s came with aluminum intakes, I think it is safe to assume the question is just what it says: which motor would you rather have?
To abide by your calculation, would imply that an iron 427 owner would take off his aluminum intake and replace it with a cast iron one.
I think Jamo is mad at me--he calls me Bob when he is.
