Small block headers: worst to best fitting. List your experience.

The hands down best fitting headers I ever installed Ford, Chevy, Mopar or anything else was the set of Dougs Headers I put on my 65 Valiant with a 360. I followed their instructions, used the Schumacher slant 6 to V8 mounts and they fit like a glove. No contact anywhere. I even used the slant 6 center link and it didn't contact the oil pan.