Manual to power steering conversion?

[berghandler]

My grandson and I are trying to convert his 1972 C10 2WD from manual steering to power steering. Starting with the gearbox we have found a used 1984 and a used 1986 GM power steering gearboxs and have seen youtube videos about getting adaptor plates for mid 60's C10's to make these fit on older C10's but have seen nothing for adapting them to his 1972. These 80's gearboxes look identical and I believe will work if mounting is done correctly to make sure alignment is correct to steering column shaft and rag joint but would like to know for sure if we can use either and what to do to make then fit and work. Have heard of Captain Fab as a reference for adaptor plates but have not followed up yet with that.

Thanks