When I put in a new open-style radiator in my 88, I used a 24k GVW/1.5" x 7" x 21" Summit universal cooler in front of my AC condensor (the fluid does not go through the radiator/cooler) and run through a remote filter on it's way back to the trans. The header panel would not go back on without some minor surgery, and my unmodified grille 'barely' fits over that. I've ran this setup since July 4th '04 and it works well.
On the trail-rig, since the AC didn't cool, and the pump is now used for compressed air, I reused the condensor in it's factory mount location. The fluid is also divorced from the radiator and passes through a remote filter. (the filter/housings mount to the LF inner fender 'hollow' where the front of the airbox normally goes)
When I have to do this again on another auto, I would set a thermostat into the circuit and have a fluid temp gage inside. I would also consider using a more efficient 'stacked plate' cooler, like the B&M, and mount it more solidly than a generic cooler's push-locks do.
I bought the first remote filter kit (SUM-G4980) for my trail rig. This housing was tapped for a temp sensor... Shortly later, ordered the 24k cooler (SUM -G4968) and another filter kit for the DD. Then ordered a third setup -for what I don't know yet
this time with a thinner 20K GVW 3/4" x 10" x 17" (SUM-G4962A) Both the later filter housings lacked the sensor port, but it's easy to see where to drill/tap for one if you need it.
FWIW more Summit PNs:
the (perma cool) filter kit with a gauge is $79.88 #PRM10677.
the $29.99 Summit G4980 kit is also a perma cool.
the B&M filter I like is 11"x7"x3/4" 19k GVW $45.88 #BMM 70268.
HTH