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767 Jockey,
I think most anything worth commenting on leaded/nonleaded/hard seat/soft seat has been already said in this thread but you might want to do one more check before deciding what to do.
What year are your heads? Were they produced by Ford for early unleaded use? If they were chances are dollars to donuts that the seats are already hardened by Ford. Of course depending on the year of manufacture and whether or not the car was built for leaded fuel it may also mean your seats are not hardened.
Redearch it a little, check some Ford sites, call FRPP maybe same some money.
Ed
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