Yes, that is the right pitch for your Arri ST. The 400ft load should fit, if you have the 400ft magazine...
Your 16ST will also accept 1R-2994 perfed film.... 'single perf'.... that is used for Super16 adapted cameras of today.
However, before you use your time to shoot this 7254 film, you should find a lab that can process it. Dirk DeJonghe's caution (above post) is correct, 7254 was ECN-1 process and is not compatible with the current ECN-2 process. Let your lab know what film stock you have before you have them process it.... they might get pissed if you don't tell them how old this film is.
ECN-2 process started with the successor to 7/5254 film, 7/5247 color neg film in 1974.