I have a set of SBC blockhugger headers that I have taken off of my 57'. They are similar in design to rams horns but exit a little lower. This lower flange makes it a tight fit on a 57' pontiac. It cleared the steering box without an issue.
They are in pretty good shape, and are showing about 50% surface rust, and the rest is white paint. They do have nice thick flanges. They fit very tight to the block.
They were very tight to the steering on my car and had very sharp 90 degree cut and welded pipes bolted to the collectors to clear the centerlink.