[LS short box]

I've used Spal fans on all my LS swaps. I've great success with a single 16" fan and no shroud. Pic of the Spal fan one of my Wrangler LS swap. You can buy the the "L" brackets from Spal that slip into the frame of the fan.
Pic of my 68.
Because I'm cheap I buy the generic LS swap radiators. I buy the biggest one I can fit. My 68 has a AFCO. My Jeep has a Griffin. The Wrangler has about 14 years on it with no issues.
Having said that I'm in central MN and don't have AC on either vehicles.
On/Off controlled by the ECM. On at 215. Off at 195.