"The "Jaguar Special" is in fact the Seifried Special -- driven by Bob Path, powered by a flathead Merc. This was the last time I remember seeing it, and the only time with this paint job (previously it was solid red). The date is '54."

From Allan Girdler's "American Road Race Specials 1934-70" pg. 26

"The Seifried Special began life as a track roadster but was converted into a sports car, with the emphasis on racing.  The conversion was a neat, clean work, especially as it was a steel body, and the car won on oval tracks against rivals with more power".  (Road & Track)

(7-28-08)  From Michael Jacobsen:

"The driver of the Seifried may be Steve Wilder not Path."