Doug’s long tubes for gen 3 Hemi

https://www.speedwaymotors.com/Doug-s-Headers-D4477-Full-Length-Header-1-5-8-In-68-74-Mopar-CC,302492. What do you guys think about these in an a-body ? I know they are listed for B-E I see they are 1 5/8 primary tube so I’m wondering if the smaller tubes will fit better.