I bought a barn find estate sale 70 convertible that hasn't been driven in 6+ years.
The air appears to be still original and all there, the compressor spins freely. I took the belt off until i diagnose it

Is there a checklist of parts I'll need to convert it to 134, and the process?
​​​​​​ Is this something a diy can do? Or do i need to find a professional?

Thanks in advance