I am also dealing with a set of RCI headers. Biggest mistake I made with my build was buying these things. The welds are ugly, they don’t fit at all, and when I tried Them on a bone stock 1969 mustang they wouldn’t fit on it either without hitting the frame. Not to mention the collector on the passenger would point towards the drivers side rear tire if they did fit properly. And I was Told that the headers are right, it’s the car that’s the problem. So I guess Both my car and my buddies stock 351w 1969 mustang are built wrong compared to all other mustangs. Lol
Thanks for the heads up.
Kurt