Swapping A/C to a non A/C car... and vise-versa

i didnt know about the firewalls. maby hold onto the duster for a week so you still have it all if it dosent work with me. i think it will tho. i really hope it dose lol for both of us what will be different for him to go to ac and me to go to non ac. and where will my heat come out lol. just floor and defrost? or are there any vents that blow at the ppl? lol