I.D these header!
Im hoping these are the el cheapo hedman B body big block headers talked about here.
http://www.bigblockdart.com/techpages/BBody.shtml
Whatcha think? They are 3" collector and 1 7/8 tube IIRC.
A lot of pics are missing at the summit websight in this group that I searched,so it's tough for me to I.D.