Bill,
I guess I started racing the '62 under '69 NHRA rules. /MP required that 3 point bar in convertibles (no bar in hardtops), with a head restraint attached to the bar, a driveshaft loop, an engine safety support strap (which was just a wire loop under the back of the engine), an approved 4-point harness and a coolant overflow can.
That was it.
Verne