That really sucks, I feel for you. I'll give you a couple thoughts - if you had the heads at a machine shop you may want to check if they routinely put any I.D. marks on them and if so, spread the word on that so they can maybe be returned if spotted. My machinist always stamps a code & date on the heads he works on so he can recognize them in the future, yours may have done the same. Likewise I've seen head porters I.D. their work. If you are on Facebook I would join Wes Adams Fe Facebook page - FordFEFanatics, and spread the word there too. Facebook has plenty of things people dislike, but one thing it does well is give people a way to share info around the world quickly. I've seen people recover stolen cars, trailers, lost dogs, etc. through posts shared across Facebook. People on Facebook then can also watch local "for sale" pages in your area, and local car club groups will get notified. And of course watch Craigslist, etc. I'll be hoping you get them back.