cross contamination from different refrigerants is why, and the fitting sizes / orifice tubes may be differant

Hi. New to this forum, but it was highly recommended... hope you can help. I'm restoring a 1980 chev SB 4x4 p/u to original condition, to use as a daily driver, and have come to the A/C part of it. It came from factory w/ A/C, so I have the original components, less the compressor. I do have a new G...