Pls recommend source for full AC system for non-AC 1971 5.2 L Duster

That was the owners choice. Trying to go through the firewall on the engine side is quite difficult due to the strange placement of the # 6 and # 10 fittings on the evaporator. Vintage Air doesn't have hard line extensions to project through the firewall. They leave the fabrication of the lines up to the installer and it is really cramped up in there....I can only guess that clearances are even tighter on an A body.
Vintage also offers the opportunity to route the lines in the right wheelwell, over the UCA and through the front alignment cam access port.
THAT is okay for cars with narrow wheels and tires but it does pose a problem for lowered cars with wide wheels and tires. The Plymouth I did had 15 x 7" wheels that had 215 series tires that only had an inch of clearance. That leaves too little room for tire flex or suspension compressing when going over bumps.


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The owner wanted the freedom to go with a wider wheel in the future so we went through the fender apron.
Mock up:

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This kept the firewall less cluttered and cleared everything.