Break in procedures?

Almost ready to start my 360 mag for the first time. Stock hydraulic roller set up new cam.
I have heard 2500 for 20 min for engines with a hyd flat tappet.
I’m unsure about zinc for a roller or the duration and rpm.
I have read that you should break an engine in with petroleum oil and may change to synthetic at a couple thousand miles.
Also I live in Fl and was wanting to know what viscosity of oil to run.
Any brand/viscosity recommendations ?
I have a buddy that has raced for 50 years and his breakin procedure was 20 min @2500
Then take it out for a full blown pass, bring it back and drain the rad and block and let it sit overnight. He got four seasons or more before he freshened it up ?????
Stock 360 passenger pan
Melting hi vol pump
No windsge tray