Doug's or TTI headers

chrgdrt said
If my research is correct Doug's 63-66 a-body-slip tubes, 2 3/4' collector.
67 & up no slip tubes, 3" collector
TTi- 63-66 no slip tubes, 3" collector,
67 & up # 7 slip tube, 3" collector.

I’m leaning towards TTI, because I would like to avoid slip tubes. For the money they cost I don’t wanna deal with leaks in the tubes.