I bought this exhaust manifold for my ‘68 FB (350, 2bbl). The manifold looks great except a thicker stud that protrudes into the manifold. Is this also originally so or was there an error when replacing the old one? I can’t compare it with the currently installed one because the project to pull the engine will start in 2 months.
If there's nothing on the other side it's a casting imperfection, probably won't affect performance much, you could try to carefully grind it down if you can reach it. I wouldn't bother
As Bartbird said you could work it with Dremel if it bothered you, I would just because we do such things, but my guess is it doesn't make any noticeable difference.