I'd say around 100-200 depending on what year and whether it complete from intake to oil pan or if it was missing stuff. The 460's with early heads are more desireable and will probly cost a little more but are worth it over the open chamber heads. There are plenty of 460's around, they made that motor from 68-96. I highly recomendpicking up the book "How To Rebuild Ford V-8's--351c,m, 400, 429, 460" by Tom Monroe. It has a great parts interchange chapter thoroughly discussing the differences and swapability of the the parts including casting number I-D charts.