From all the hunting i did, I get to answer my own question. So maybe some useful info for someone else.
There's probably some other configurations out there, but this is what i learned. Even found some big blocks to look at but no small blocks.
On a big block truck with / with out ac the remote reservoir sits atop the alternator bracket, hose running across the top of the water pump to the steering pump.
Ive also seen a big block truck with out ac and the remote reservoir sits atop the two driver side blots of the water pump, hose S-curving to the steering pump.
On a small block there does not seem to be a factory setup with remote reservoir like i thought. Most steering pumps are local reservoir with the fill cap pointing up center or to the driver side.
The diesel also has remote reservoir option but i couldn't find any mounting location info for the remote and the fat compressor.
In the case of the 1985 -1987 bracket that i have. The correct pump would have the fill cap pointing to the passenger side when ac is installed. any other pump cocking dose not fit or allow you to remove the cap or get a hose on with the fat ac compressor in place. The older long body compressor may be a different story as it sits way higher leaving more working area around the steering pump.
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