[joyridin']

Probably the most common generic header would be for an FFR and you would want to go to one of their forums to get those measurements. The issue is going to be most F5 cars do not use FE engines. I don't think I have ever seen or even heard of somebody putting an FE in one of their Cobras, although I am sure it has been done.

Just for reference, I spent $1200 on my customer made headers and due to where the engine sits, the outlet is almost in-line with the front exhaust port they are swept so far forward. They are 304 SS if I recall and after 6 years, still look absolutely great. I got them from GP Headers.