good T stat temp for motor break in

Thanks all for the input just nervous as its my first time doing this. where i cruise when its 100 out on the asphalt. if i miss lights and have to wait for the entire cycle maybe 3 min total, when I had my 318 that sucker shot to 220 just in that time with a 19 inch fan and new oem 2 core and the car did not have a big cam. It always ran warmer than most 318s that were in my area that I knew about with a 190 stat. She liked clean air to cool down which she did real quick but never overheated. Im not going to run my heater lines cause I'm nervous that since it has the original core that it may start leaking on my new carpet with entire new cooling system. I drove her 318 motor for 3 years 7 days a week though and never broke down on me.
Ill buy a box fan for her, it'll fire next week, have to pull my valve covers to put oil over the valve train so i don't dry start them as this motor been sitting as money comes in to finish her finally