My accessory drive is stock except for the AC compressor. I used a Vintage Air, LS Mount Bracket 7176 to mount the AC compressor, which worked great.
My fan is mounted on the condenser in front of the radiator. It’s a Flex-A-Lite, 239/119 Pusher Fan that puts out 3000 CFM. The engine coolant temperature sensor or the AC Trianary Switch will activate the fan.
I’m not familiar with the Holley setup.
How far from completing your truck are you?