yup. doesn't matter what pump you are using if the rest of the system isn't correct..
i'm running the correct pulleys for a non a/c 70-up small block
high efficiently recored stock 318 with a/c 22" rad.
proper 318 with a/c / 340 fan shroud
5 Blade Fan 4140063
hayden short fan clutch 2947
i even put the hood to rad support seal on the car.
runs nice and cool.. can sit all day in traffic.