Looking for advice on A/C

Thanks for the information, I will consider the option, but I am probably going with the under the dash setup - I think the install might be easier than trying to convert the old Valiant ventilation system .

Not much help on the under dash end but my 68 sure liked the Denso compressor off of the mid 90s Intrepid chassis. Draws much less power, single V belt drive, build your own bracket and works with my stock expansion valve system. Only other mod other than adapting hoses is using a relay to power the clutch coil. It draws more current than the OEM switch is designed for.