Remember that T-Birds run extremely hot, even with decent cooling. although 63 C is hot, it is still safe for the t-bird. In fact, the t-bird can operate quite normally at 75 C, provided that is an accurate reading.
If you don't mind spending the money, I'd definately suggest getting a higher quality heatsink and more efficient fan for that tbird, just in case that temperature reading is inaccurate.
If you are someone interested in case modding, a simple mod to improve airflow is to mimic the P4 cooling standard for cases. Drill ventilation holes in the case side panel above the CPU, and put a funnel over the holes. This will allow the cpu fan to draw air from directly outside the case.