74 C10 Serpentine Conversion

[MrFiveOh]

So I have a 74 C10 with Vbelt setup. I already have a serpentine setup from a 89 C1500. I haven't seen much in detail for this swap so I'm reaching out to get input.

AC compressor and power steering are my main issues.

Power steering in a 74 if factory so I have standard fittings into the gearbox while 81 and older trucks changed to metric.....is there an adapter I can use with the new gear box to the standard fitting on the existing gear box.

AC is factory from an 86 C10, however it appears the serpentine R4 compressor has the pressure switch built into the compressor itself instead of on the drier/receiver like C10s have.

Does anyone have experience with this, it would be greatly appreciated.