Update on My 64 Dart project

Thanks. That may be a bit much for my 273. I was thinking 1 3/4" That will work nicely in your application
Apparently TTI is making step headers now 1 5/8 to 1 3/4.When I started searching for the bigger tube headers,they only made them for W-2 heads.Figures they make the step ones now.Dougs 1 5/8 were like peashooters LOL.