Just for reference Bess ( the C10 that has r12 system) Had a minute amount of pressure and was still sealed according to the vac, without changing anythign i put in lpg (summer mix I think) and it got to 1 deg C at the evap.
it still cools to that a year later, does it cool the cab, not really because 70's a/c is garbage, but hey, it cools
just make sure the cabin drain is open and youll be fine.
$15 of LPG or 9053065306985439453098$ or r134/r12/ whatever.
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Or dont, its your car.