Cab and AC questions...

[kevncar]

Working on a 67...but I want a big window cab. I know one of the differences between he early model cabs and the later model cabs is the parking brake. Is it possible to just install the hand brake from my 67, or isnthere something different about the cab that won't let that work? Also, I want ac and all, but plan on going to an aftermarket setup, for a cleaner firewall. Are there any aftermarket ac systems that have recirc and fresh air modes?