A reputable machine shop can clean it and mag test it for cracks. These heads were very prone to cracking. As Ashton mentioned, it would probably fetch $100 as a "cat in a bag". If it is not cracked, prices I mentioned would be in order from someone who wanted one. If it is cracked, it is worth scrap iron price. The price a machine shop would charge to test it depends on the shop's reputation and prices in your area.
