The first set of headers I ever bought were summit brand headers for my 71 Swinger 318. Cost me around $79 back in 1999. I still remember the pain in the butt they were to put on and then to take out. Told myself since I would never buy a cheap set again!! Only took about 2hrs to put em on but it sucked. The inside bolts on 1,2,7,8 were really sucky. It's like the maker didn't indent the tube enough to get them in right without having to shift back and forth. I did have manual steering though, so that part wasn't bad.
Then every time I'd change the oil filter and oil would leak onto the tubes right at the collector, oil would start running out of the collector!!! Very poor weld quality.
When I went to pull the motor I ended up just having to cut the tubes at the mounting flange because the bolts previously mentiond wouldn't come out all the way, they were hitting the tubes. Don't know if it was because the heat expanded the tubes or warped, i don't know.
It just sucked!