So can the 6.4 heads work on a 5.7 bore? Even with say a .020" overbore? If so, I am going to pull the trigger on those heads that sixpackgut mentioned...wondering if they are bare or complete heads for that price also.

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Based on info from this read I would say no.. read it
for yourself
http://modernmoparforum.com/topic/12135-57-61-and-64-hemi-cylinder-head-comparison/