You just might have to go a custom radiator in order to fit it in front of the engine using the original mounts and still have room for an I/C.
I've done the 1G-GZE conversion into a RA23 and the S/C crank pulley width means the radiator has to go on the outside of the original mounts. I used a KA/KB Laser radiator (thanks CLG) and with a few minor mods it fitted perfectly.
I then only had enough room for a A/C rad or an IC in front of that before I hit the grille, and given Perth's hot summers, I went the A/C gear instead.
Good luck with it all.