Fellas,
I think those headers with the Edmunds intake are old Clark headers. They look just like the ones in an old catalog I have. They appeared to be both formed and welded.
While we're on the speed equipment subject, who made this,
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=019&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=290061705923&rd=1,1
Bob