75c is pushing it temperature wise, but it would be safe, that is a very nice overclock at that voltage, you have some luck on your side
You can tend to keep your temperatures under 80c at maximum, most people tend to aim for 70c at maximum. Anything above 80 for long periods of time may slowly cause damage to your CPU, not 100% true in all cases but it can, 90c+ will most likely cause damage, but you wont reach that.