I would do a before and after test on CPU temps before I just leave it alone. Just when you think everything ok it will heat up cook right before your eyes.
Some motherboards have a CPU temperature monitor running thru the B.I.O.S. , but yours is a dinasour so I figure it doesn't have one. You can install a program called Motherboard Monitor (or equivalent) " seen here -->--->---> @ http://mbm.livewiredev.com/
First, return your jumpers to their original settings and see what your temps are. Also look at cpu voltage. An increase in volts makes an increase in heat.
Compare them to your overclocked settings.
Most of those older models didn't have a fan on the CPU heatsink so when an overclock is done the heat increase is certainly noticeable even to the touch of the heatsink. A difference in a couple of deg isn't bad but if you are near a 10 deg increase then a larger heatsink may do, but a heatsink with a fan mounted will be your best bet.
Don't forget to vacume the dust out of that thing. It holds the heat it and blocks air circulation.
I gave my mom a PC last year and took her old HP that she bought 8 yrs ago with a 120MHZ /1 gig HD w/ Win95. When I got it home I took the cover off and the dust inside was unbelievable.