[radar1]

The headers that I used were Headman headers part #HED68198. They are 3/8 flange, 14 gauge tubing, with ball type connectors. I am not real sure about the square port fitment. But I am real happy with the fit. The only modification that I had to make, was to grind the cup that mounts to the block on the passenger side for clearance. These were listed as fitting a 68-72 big block chevelle, however when they arrived, the box listed them as a 67-68 big block Camaro. Any way I am happy with what I have. Hope this helps.