Regarding Beatty and Truex, Beatty initially competed for the Santa Clara Valley Youth Village [ San Jose Area] under the tutelage of Mike Igloi. When Igloi's cadre was lured to Southern California by Dick Banks[ there is a lot more to this part of the story] and formed the LATC, which later became the SMTC. Beatty and many of the group moved to the LA area. Related to Truex's outstanding 10,000 at Rome. Igloi gave him some training guidance and also suggested whom to run with during the race to maximize his performance.
If you want to know more about Max , his brother Don, who was a dentist and used to live in SoCal, probably could help. Don was a solid runner[ not sure if he is still alive]. I believe that Len Truex who was a very solid runner at Ohio State, in the 1950's is/was a brother of Max and Don.
The other person who could help related to the above subject is Joe Douglas. Joe was Igloi's heir related to the LATC/SMTC group.