340 Headers...

Indeed. I should clarify that my headers are old and from the 70's. Most all of the more modern ones I've seen have the #3 cylinder runner loop up and over. That's to leave adequate clearance for the steering as well as the starter, which will reside right in that gap between the tube that comes down from the top and the other three that sweep under. It's not much fun to change the starter with the headers in place, but with a lot of extensions to get to the bolts, you can swap out the starter without pulling the header.