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So i kind of take all of that back. 92-95 regals with the 3800 don’t seem to have them. I just found a bunch of pictures of 91s with the 3800 that have them! If they are designed to help promote crumpling in a collision, the only thing I can think of is that there is more clearance somewhere in the engine bay with the 3800 series 1 that they aren’t required.

If it regularly occurs below a specific fuel level, I'd start suspecting an issue with the fuel pickup inside the tank. Perhaps a cracked suction line that once you drop below a certain fuel level, it begins sucking air and isn't able to supply as much fuel as required? I’d expect something like that to show up on live data as reduced fuel pressure and a lean condition, but being intermittent, there might not be codes stored.

Not all 1st gen Ws have the rad support bars. My 88 and 89 Regals had them, as did my 92 Cutlass. Those cars had the 2.8, 3.1 and 3.4 respectively. My current 92 GS never had them. The holes are there...but they were never tapped for threads on the rad support end. It seems to have something to do with it being equipped with the 3800 series 1, as those are the only ones that never have them. 2.8, 3.1, 3100, 3.4 and 3800 series 2 equipped 1st gens coupe or sedan all seem to have them.