Robert, The dyno is in North Carolina, near Salisbury.
Superformance/ Olthof Racing.
You should see this place. There where 5 GT-40s (plus mine), 3 Daytona coupes and 6+ Cobras there in various stages of maintenance.
They have a just completed EXACT recreation of a 427 Mark IV. Sounds mean!!!
I guy in Denver NC built 6 new GT-40s by original plans.