I have a pair of 3946074 open chamber heads dated 10.7.69 & 8.26.69 for sale on eBay with a reserve price of $1999.00. They have never been installed and have new valves, springs, and retainers. Please check them out and see if they would work for you. 12 pictures.
Here's the link
http://cgi.ebay.com/ebaymotors/ws/eB...&viewitem=
Thanks