Don’t over think it. You need a compressor and bracket, which lots of 6bts came with so it should bolt on. The sanden 508 is like the Chevy small block of the AC world. They work well and there are a million variants with different kinds of ports. You need an evaporator and a condenser and a receiver dryer, the bigger the better on the evap/condenser for better performance. After that it’s custom lines which some hydraulic shops will do for you. Almost all of them can do the crimping of you bring them the line and fittings.
Vintage air stuff is really expensive for what it is but you are not paying for HW, you are paying for their expertise
Lots of line kits and vintage air type under dash boxes with built in blowers and orifice tubes on eBay
