I just got done overclocking a 1.8A to 2.4. I had to up the voltage .75 volts and under heavy load it was 54 C. I think you're okay but it seems a bit warm to me. In my experience with stock cooling the P4's run in the high 30's to mid 40's at default voltage.
Okay, brain. You don't like me, and I don't like you, but let's get through this thing and then I can continue killing you with beer. -- Homer Simpson.