Re: 1 7/8" Header for SBC in first gen !
For years I ran the Hooker 1-3/4" Super Comps and 1 tube needed to be dented to clear the steering box. When I built the 427 that's in the car now I contacted Lemon's and they built a set with 2" primaries and 3-1/2" collectors. They fit awesome with no denting needed.
I bet that is a PITA to change plugs on #5 &7