I've seen a few threads on here about people looking for Drake 16v heads for sale. In a nutshell, I worked at Drake in the early 1980's and I ran the sales division for about a year before the street car division was sold off and moved to Yuma, AZ. The race division designed and manufactured the heads. When John Drake retired, he sold all the rights to the Drake patents, molds, and designs to former Drake Engineering principle engineer -- Stewart Van Dyne. Stewart started his own racing shop in Huntington Beach, CA in the mid/late 1980's.
As of today (March-2011), Stewart has 4 or 5 of the Drake 16v heads available for sale, and one complete motor (displacement uknown). I'm pretty sure he has the molds and CnC programming to make more heads if necessary (but I'm not 100% sure).
Anybody interested in the Drake 16v heads, please contact Stewart Van Dyno @ Van Dyne Engineering: