Simply awesome! Will the grill allow enough airflow and the use of the TJ A/C system?
I've mounted the radiator, so here's more detail...
Since the Wrangler radiator is narrower than the CJ radiator, there will be plenty of airflow. To mount the Wrangler radiator in the CJ grille shell, mounting brackets are required. They're are pretty simple, a pair of sheet metal "z" brackets to recess the radiator about 1" into the shell. I made a pair from scraps of sheet metal left over from cutting up the factory TJ hood that I used in making the custom hood for this project. The brackets have holes for the radiator clip nuts. I'll probably need to adjust the final height of the radiator to match the engine fan when it gets installed, so all I'll have to do to is drill different holes for the clip nuts.
The brackets mount to the holes that already exist in the factory CJ grille shell:
Here's the whole thing in the mockup.
In the next shot you can see there's almost 1" between the front of the radiator and the grille shell, that's where the AC condenser goes. Also the tape measure is showing about 34" from the firewall to the radiator, which is the same measurement as on the factory TJ, so there won't be any fan-radiator clearance issues.
Can't see through the grille anymore

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No new holes needed to be drilled in either the grille shell or the radiator, all it took to mount the Wrangler radiator in the CJ grille shell was the pair of z brackets.