I put a Rod & Custom front under my 67. It put the motor where I can only use a 12 inch fan if I run it from the water pump. I'm wondering what you guys are using to cool your big blocks. With a 3 inch thick core Griffin I'm wondering how much fan I will need. I have room for 2 10 inch and probably 2 8 inch fans. The 10's move 1250 and the 8's move about 400. I'm wondering if this will be enough. I'm hoping the extra water from the rad will help. Perma-cool's site says you need over 4000 CFM on a motor my size and there is no way I can get that much fan in there.