I thought throw this out in case someone is looking at Pacesetter truck headers. I bought a set from that auction. When they were delivered they looked new and the flange was a little beefer than the headers I'm currently running. I started to mock up the headers with the Offy 4bbl intake the other day and there is a clearance problem. The extra material on the flange won't let the Offy manifold clear the flange. Pacesetter added an extra 1/8 of an inch to the inside of the flange between #1 and #2 cylinders. The Offy manifold also appears to have some extra material on the bottom of #1 and #2 intake. It looks like I could remove some material from the Offy with out getting into the gasket area. I don't see a problem with #5 and #6 7yet. Haven't decide which way to go yet, but the header is the likely choice for cutting. I have no idea what year either the Offy or the headers were made. I did send an email to Pacesetter via their web site and have not got an answer.
LG
