You realize that Slot A T-Birds were made specifically for the old AMD Irongate chipset mobos. And that there's a problem with the KX133 chipset running them over 800 MHz. So, since you're interested in O/C, I wouldn't recommend a Slot A T-Bird/KX133 mobo combo. Just get a Socket A/KT133 combo.
1.Old Antec Case, Asus PC-DL, 2 x 1.6 LV D1 Xeons @ 3 GHz, 2GB Corsair PC3200 @ 200 MHz, Chaintech 6800 128MB AGP
2. Old Crap Beige Case, Gigabyte GA-H55M-S2H, Core i3 530, 4GB CL8 OCZ DDR3-1600, eVGA GTX465
3. Asus Pundit mATX Case, MSI AMD Zacate E350/dual core E350IS-E45 mini-ITX, 4GB CL9 Crucial Ballistix DDR3-1333, LG Blu Ray/HD DVD & DVD Burner