I love that picture TJ....
Now, block out all noises and imagine that picture with SOUND...........
Bill, actually it may have been only a 3-point roll bar. 2 uprights and one diagonal behind the driver. That's all NHRA required as late as '70 in my D/MP convertible. (don't know about AHRA).
Early FX cars didn't require a bar at all (or a helmit or seatbelts)
Verne