SFCJ
It looks to me like you have the perfect opportunity to build a replica of the first 427 chassis style car to be raced by Shelby, S/N 3002. I believe Mike Kenney could shed some light on this as I believe he was involved with cloning 3002 back in the Hi-Tech days. According to an article in the Jan 1999 Kit Car Magazine the body for the first 427 raced had an FIA style body with the forward braced rollbar and 427 style side pipes. Check it out, I could e-mail you some pics if you like.
