What kind of fan are you running? Regular mechanical, clutch fan, number of blades, etc? Which water pump-regular or high volume?
Doesn't really sound like you need much, so the fan shroud might fix it by itself, but there's a lot more to it than just the radiator and shroud.
Also, I have a couple of original fan shrouds for 22" radiators and I'm pretty local, so I'll check the numbers on what I've got and see if I have what you need.