not just any 22" shroud will fit. The later model 22" radiators were different. The shroud with number ending in 614 has been repoped. It's for the V8 radiator with lower hose on opposite side but it will bolt right in installed upside down.
Adding a shroud may not solve the overheating problem. I cant say I don't understand why a person spends a bunch of money on a new engine and wont protect it with a new radiator 'cause I made the same mistake myself. I fought overheating and pinging under load for a long time and tried everything else ( less expensive ) first. New radiator was the cure.