It depends on a number of factors.
Are the Warped? Cracked? 2v or 4v heads? Year?
I understand 70 closed chamber 4v heads to be worth the most. Find a casting number and let us know. I'd be in the marked for some nice big ol cleveland heads myself.
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1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13