I'd like to know if the AC components used on a small block are the same as those on a big block other than the mounting brackets. Just curious what it would take to keep the AC when putting a 440 in where a 318 with AC currently resides.

Brackets would be different, AC line lengths and wires may be a little different.

Are you thinking of using the OE iron V twin compressor? It can work with new refrigerant but its a heavy thing. The old lines can work also if they are in decent shape... a big if after 40 years.

I repowered a 318 AC car with a BB and went with a Sanden compressor from Bouchillon with new lines. The original in cab part was restored. The Sanden compressor is a lot lighter and the setup works fine.

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Are you thinking of using the OE iron V twin compressor? It can work with new refrigerant but its a heavy thing. The old lines can work also if they are in decent shape... a big if after 40 years.

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Yes, I would like to use the entire original small block set up if it is adaptable to a 440.

I'd say the minimum parts requirements would be the brackets, an expansion valve for R134 and a receiver/dryer for 134. That is assuming you will upgrade to R134 which I reommend for future servicability. Lines may work and wiring will work or be readily adaptable.

Optional would be a bigger condensor to go in front of the radiator. 134 puts more heat in the condensor and the original may be marginal.

I believe there are better seal materials for the iron compressor for use with 134 but the original setup can work fine if it is in decent shape.

First step is to get all or as much as possible of the old oil out of all components. Flushing solvent is available for the lines and heat exchangers. The compressor needs to be dumped out as much as possible.

Classic Auto air in Florida is a good source for parts. Bouchillon is another.