How many races had #99 gainsco/bob stallings racing in round 10?
CREATE TABLE "table1_19751479_4" (
  "rnd" real,
  "circuit" text,
  "pole_position" text,
  "fastest_lap" text,
  "winner" text,
  "results" text
);
SELECT COUNT("fastest_lap") FROM "table1_19751479_4" WHERE "rnd"=10 AND "pole_position"='#99 GAINSCO/Bob Stallings Racing';