Factory AC or aftermarket

[Geddes71]

Brand new member. I just bought a 71 chevy SWB with a factory AC cab and original BB402.

Here is my question. The cab is a factory AC can but the guy I bought it from did not reinstall any of the factory heat or AC. His plan was to install an aftermarket system. He even filled in the AC openings on the fire wall.

I feel like part of the value of having an AC cab is also having the original system in tact. He gave me a lot of the original AC parts and I'm considering just trying to have the original system re-installed.

Looking for opinions on this in regards to whether it impacts the value regarding original or aftermarket.

Haven't the slightest idea how much someone would charge to reinstall the factory system. Will I end up spending more to stick with original rather than just buying a $1300 aftermarket system?

Thanks