Sorry about the slow reply. Your project sounds great!
I used a BeCool LS swap radiator. Honestly, I only gained a small percentage of additional core area, but the modifications to the grille and then the snowball effect of headlamp clearance etc. along with the need for a slight body lift to clear the frame rails left me thinking it was not the wisest decision. The fan is a Lincoln MKVII unit trimmed to fit. It’s a powerful 2 speed fan- but very deep and there was a water pump swap and belt routing reconfiguration needed to get adequate clearance.
It’s still a ways off from being driveable so I don’t know if all the effort was worth it.
My last 5.3 swap used a Northern aluminum radiator and the stock LS truck fan with a shroud. It never gave me any issues.