possibly it's the John Edgar Maserati 450S, in August, at the VIR
strange but the #98 was previously on Edgar's Ferrari, and Maserati 300S,
here is the #98 410S Ferrari, and notice the kidney belt Shelby was wearing over the shirt, that in the 300S Maserati. So, cars with #98, same race series, same Carroll Shelby.
Mokuleia, Oahu, April 21st, 1957. John Edgar's wife, Geraldine, in Hawaiian Easter bonnet, with Olympic swimming champion Duke Kahanamoku, among other prominent islanders, at Dillingham Field races.
By June, Shelby was racing in the 450S Maserati that Fangio and Moss had used at the ’57 Nürburgring 1000-km, and Moss had raced in the Mille Miglia
Here he is in the coveralls like the first photo, with the 450S, in August at the Virginia International Raceway (VIR)
Carroll Shelby, John Edgar, Race Queen Jan Harrison, incredibly beautiful, and the future Mrs Shelby. She was race queen at Riverside on the 17th of Sept, and Nov in 1957