I am using the orifice tube, without temperature control. I have the flags set as per an L-body car, which also used the orifice tube. (at least I set them by putting the L-body bin in the compare bin slot, then went through the F-body manual bin (the only rear-wheel drive configuration) and changed all the things that come up in a ctl-F "A/C" search to match the L-body orifice tube settings.
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