Possible header option

[ron19]

I'm looking at a set of headers and want to know if anyone has experiance with them or if anyone knows of drawbacks associated with this type of header. They are made to fit 67-72, but I've seen in other posts were others have used those year of headers. For my application, I'm wanting a bigger tube header as the 1-5/8 typically made for these years won't flow enough for my 406 I've built. I've attached a picture and a link to Summits site.

http://store.summitracing.com/partde...32#Application