From an article in Feb 5th, 1999 issue of National Dragster:

“In final round appearances during the 1973-1975 seasons, the most dominant Ford in Pro Stock was not driven by Bob Glidden but by Wayne Gapp. The Livonia, MI.-based racer appeared in 16 final round rounds to Glidden’s 12 during that period, winning six of them and the 1973 World Championship crown.

In fact, Gapp had more final-round showings in those years, outdistancing luminaries Bill Jenkins and Don Nicholson, who had six and three appearances, respectively.”

I did not know that.