Sorry Stan, still no go. The AMD 350 etc require the motherboard to have a FSB ( front side bus) speed of 100Mhz Your motherboard ( and mine, I run an AMD K6-233 CPU ) only have a FSB of 66Mhz. To change the FSB req's a major redesign, new chipset etc, etc:
I'd be interested to know the FULL specs of your system - ie: not just 4Mb video card, but made by who? likewise all other bits in your Box. Some manufacturers make decent gear with good software drivers, some are mediocre and some are ***** !. The performance of any PC is based on the sum of it's individual components. A Morrie Minor is not going to go too far if you put a Ferrari V12 in it and still use the Morrie's gearbox!