I just installed Hedman headers and had/have 0 issues with 4-spd linkage clearance. I did have to dimple the tube next to the power steering pump though. I have a 440 in an E-Body...

70 Challenger, 440, 4-speed, pLuM cRaZy
71 VW Super Beetle Convertible, Lemon Yellow
A couple of Jeeps…