Mine runs the vintage HOOKERS, and measures 23 3/8 tall in the front with 225 x60x15 tires, looks or hangs down the same.
The Hooker Super Comps have never changed. However, They are really low.
-Keith
Bob Gaines had a really great set of headers on his '67. He had posted pictures of them on the old crashed forum. I don't know if he still has those pics. They had a lot better clearance then the Hookers which I think really are the problem. They were big tube, non tri-y and full length as well. Nice.
That's the difference now between $500 and $3500 headers? Unfortunately BB Mustangs are maybe the poster child for impossible or nearly impossible scenarios.
Whether they were worth the effort to get them in, you'd have to ask him.