I had a similar deal going on, things were good when in motion but would heat up a lot at idle/sitting still.
Added a shroud and also swapped WP pulley to a somewhat smaller one to speed that up a bit.
Temp dropped from over 200 to 175. Car never went over 180 again.
No room for fan clutch, it was a pretty rumpity 512" Duster, 26" alum radiator, separate ATF cooler.
As for thermostats, I long ago started checking them in a pot of water brought to boil with a meat thermometer to check opening/closing temps.