Retro Fit Factory A/C into Original non-A/C 1968 Barracuda Convertible

I am researching engines again while the body and paint work move along. Anyone have input and experience of what I'll need to source/do to accommodate a factory A/C set-up from a Slant 6 with A/C for my car orignal car that did not have A/C?

I'm still weighing the Slant 6 option, but may have a beat on a rebuilt one with PS & A/C for $2500 and a automatic 904 trany included. After looking into the rebuild of mine into a performance config (Snipper + Suprchg) at $12-15K, I'm considering that option against a rebuilt 318 from Engine Factory at around the same price point and appointments. Either going that route, or considering the $2500 available Slant 6 as a pathway for several years, then upgrade suspension and engine somewhere down-the-road if/when the cost over everything in the brave new world comes back to reality.

As always, wisdom, constructive thoughts and suggestions appreciated !