vintage air evaporator kit and laid out trucks

[draggin86]

Ok so i read some place if you have a factory AC truck and you want to get rid of the box off the firewall when laying out your truck you can use the vintage air evaporator kit not the full kit.. i just want to make sure this is true and i dont need anything crazy. background on the truck factory AC truck i am putting in a 5.7 vortec motor out of 96-99 silverado's which has the compressor on it.

thanks guys!