Restoration Decision Help!!

[HazelsHoney]

Hi All,
1972 Chevy K-20 4wd, Complete build, Frame Off, looking for some input as we progress.
1. Convert to electric fan or keep OEM?
2. Convert to Hydraulic brakes or keep orig OEM master cylinder with vacuum booster? I am using the original OE set up, disc front and drum rear.
3. Convert steering column and steering wheel or keep orig OEM? If conversion any input on year, make and model that is popular to retrofit with?
4. Originally a NON-A/C truck but thinking of converting using Vintage Air or LMC Trucks brand. Input appreciated.

Thanks in advance for your input.