Summer Water Temp Baseline?

100 degree/high humidity days are upon us again.

1968 Slant block, mild mod's, automatic trans

Running a stock, (good condition) 19" radiator

Stock timing, electronic ignition, vac advance

Mechanical, stock-style fan

New water pump

180 thermostat

13lb cap

No puke tank

No shroud (YET! It's in the works)

A/C

Using a laser, temperature gun:

What are the maximum allowable temps measured at the radiator intake and outtake necks at idle, in gear, A/C on?

(I have both under dash and in dash temp gauges)

Thanks