Headers and clutch linkage

[Ronno6]

I was looking at some Hedman headers and read the cautionary statement that clutch bellcranks or crossshafts may interfere with the headers.
They do recommend a set for this application.

Have any of y'all encountered this?? (I realize that the hydraulic clutch is preferred, but my pedal assy came with all the manual linkage stuff. So.......)
What headers are y'all using with manual clutch linkage setups??