Difference in vintage air kits?

[Harrison.]

I've searched some and poked around on their website/summits website but I can't seem to figure out all the differences, especially between 941170 and 941171. My truck is a non AC cab, but I want to use factory appearing controls and I want the vents in the dash. I've installed a VA kit into an early mustang in the past and it had a unit that mounted under the dash, which I didn't hate but I'd much rather have vents in the dash. Do I need to cut holes for factory vents or do the kits for non AC cabs use vents that are placed in the dash? Is there a different kit that people recommend? I'm also not sure about mounting the compressor, my truck is a big block truck and the alternator is mounted on the pass side and PS pump is on the driver side. Anyone care to shed some insight?