I think those are the Herman Lewis heads. I read on another board that there were some problems with them, and they probably wouldn't be producing any more. Still have Indy and Edelbrock though.
Bob.
tufcj
Just as a follow up, I found the thread. These may be leftover HL heads, but new ones may be made.
http://cgi.amcforum.net/cgi-bin/yabb/YaBB.pl?board=Engine;action=display;num=1091505786
