If I remember right the Moparts Engine masters entry made it's best power/torque curve with some no name 1-7/8" headers. Years ago I spoke at length with Ed Henaman of Headers by Ed. One of the ideas he stressed was not to go to big with the tube size and was a great advocate of equal length tubes.
Ed paid a lot of attention to the transition from tube to collector too.
A lot !
But he made some nice headers.
I bought a lot of parts from him over the years , but never had a combination that he made headers for.
