#92 is the late Rod Farris. I love this photo, but I don't know who took it. The Simpson Bandit on the rider in the foreground. Farris, feet up and drifting. The Gary Nixon sponsored leathers and Nixon style helmet. The thick stripes of blue groove and roost hanging in the air.
Farris was from Maryland, the same state at Nixon, that must have been the link. Farris scored 15 GNC podiums but never a win. He died in a GNC main at DuQuoin in July 1995.
I think 33 is Dave Hebb. Not sure who is wearing the Simpson.