Overheating issues

Hi, has anybody here tried to add a pusher fan to the front of a Champion radiator to bring temps down in stop and go traffic or idling. Right now I can idle for about 15-20 minutes before I have any issues, but then the temps go up and over she boils. I can't find a shroud that fits and I just added a 6 blade Flex fan, but that didn't help.
I had a 15" pusher fan in front , mounted as far from the rad. as possible on a 68/505'' barracuda. I took the pusher off like a member on here suggested, it hasn`t helped .
It was comforting to hear it kick on at 200* when sitting at a stop light .
I am currently looking for smaller than 7" waterpump pulley for a single belt big block. Don't think there is such a thing.