...Will an AMD 450Mhz even need a heatsink for the CPU...!??
Ok...Is it an AMD K6-III?
There is a K6 at 450Mhz. If so then it has 321-pins on a CPGA array. Not sure what socket that is though
Basically, the heatsink should just clip onto the CPU (with thermal interface between), then the fan should either clip onto or be screwed onto the heatsink, and then the heatsink be plugged up to the motherboards dedicated CPU fan connector (usually a 3-pin socket).
Are you sure you'll need all the other case fans too???