small block headers
I am very happy with my Hedman long tube headers. Yes the drivers side loops under the center link but in 20k miles I have not had any ground clearance issues. Plus these headers fit great and clear everything including the power steering box.
All long tube headers are going to be work to install but if you jack the car up at least two feet and pull the steering column (about 20 minutes extra work) it is straight forward.
I also recomend switching to magnum v8 plugs. These are the same thread and heat range as LA plugs but have a 5/8" hex which allows you to install them past the header tube on cylinders 5 & 7. It's also a good idea to use a spark plug wire with a 90 degree boot on the plug end for cylinders 5 & 7 and route the wires under the header tube.