If you have good cooling i (RE GOOD COOLING) i think it would be safe to have the Vcore upto 1.9-1.95 Volts... with good cooling.
1.8-1.85 is you cooling isnt the best.
As FSB goes... if your hardware is happy at that speed go for it.
You dont really have to worry about the FSB being to high for the CPU but rather the rest of the cards (PCI AGP ect..) in your rig. Your PCI speed is 41.33Mhz... it should be 33.33Mhz, and as long a your cards (harddrives) are happy at that speed, your happy.
Is 133 FSB out of reach?