big block cooling

Have a 26 inch Griffin rad w/ 2 Permacool thin profile fans in a custom shroud in my BB Duster and still have some cooling issues sitting in traffic but no clearance problems....Planning to go w/ a Mancini high volume water pump; stock pump in it now. Look into the 10 blade higher CFM fans from Permacool not sold by Summit same thin profile - wish I had bought them.