Easiest thing to do is place a small fan behind the clock. The only true way to determine if you will have a thermal reliability problem is to find out if heat-sensitive devices are running at or over their rated temperature. One method is to measure the case-temperature of devices, estimate the power-dissipation of the device, find the thermal impedance from the datasheet (theta-JC) then calculate the junction temperature. It's a pain, because you have to place a thermal probe on components, close-up the case, and let it stabilize.
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