what is the best air cool that will fit a socket a because i overclock my cpu and it get very hot
Such an old, aging socket. Not worth buying an aftermarket cooler for, just upgrade it. You won't find many options for such an old platform.
However, here are the two coolers that I found: http://www.newegg.com/Product/Product.aspx?Item=N82E16835230028&cm_re=socket_462-_-35-230-028-_-Product
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