I think that the air hoses on the 64 Ford 427 Fairlanes were 6"? You can get close reproductions to them at one of the reproduction sites like Crites.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.