I have a aftermaket CPU cooler , can i make use of my old AMD Stock cooler ?

Keep it for a backup cooler. I have an EVO and my stock cooler in reserve for my system, and another AM3 system in my house.
As for the fan, its a small 60-80mm fan (if I remember correctly), meaning you will be hard pressed to find a place to put it, and it would be loud, with minimal airflow.