tti header fitment

One thing I did notice is all headers made today including these fit better when using 1973 and newer center link, Pitman and Idler arm. The castle nuts and studs face away from the header and are less likely to do damage.
I noticed this after installing the same headers on the different years. Probably why owners of Older a-bodies are always looking to upgrade. Did any of you ever encounter your pitman or idler rubbing the exhaust on pre 73 cars?