Lets talk radiators/shrouds

Get the stock fan shroud that goes with your GTX. Someone broke or took it off the original that was designed to keep your car cool at low driving speeds. Then add the MP viscous fan clutch and fan package.

If your brass radiator is not clogged or leaking, keep it.

What year GTX is it? I assume with 440 motor? What is the part number stamped on top of your radiator? Don't assume it is the orginal one or even right one for your car. Many times people will put C-body radiators in B-bodys. Sometimes the move the neck to the correct place, sometimes not.

With that info, someone here can tell you the part number of the new shrould and fan size that was original to your car. That should do it.

The inexpensive aftermarket ones will not fit as good, leave bigger gaps between your radiator and core support, and not have as an effective and tight fitting shroud out of the box. You'll have to tweak, modify, add foam, etc to get as tight fitting setup as stock.