Like Dparker and CP said a shroud will help if you don't have one.2 12 in. fans are about 230 sq.in. a 17x27 rad core is about 460 sq.in.so your only pulling air over about 1/2 the rad.About retarding the timing that will put more heat in the cooling system most times,on the other hand removeing some mech.addvance and adding some initial timing will let it run cooler at low rpm an still have the total timing at high rpm.Bill.