Well..........yes,......those screws appear to be equivelent to about a grade 3,......about the same as any other screws in most any other carb. If removed w/ an impact driver, or in my case, removed w/ solid mechanical pressure applied to the driver,......tho very tight, they come out just fine. I defy anyone to tell that mine have ever been removed. But I like Allen head screws too, even if not ss.
BTW, ss screws in general are by far not the strongest grade of metal. Maybe the allen head ones are a better grade, I don't know. One thing for certain, the allen head won't strip as easily,......providing the driver is in decent shape
But the way,....what was it messed up w/,.....any pics ? I'm still looking for 1st hand hard core evidence of contamination caused by gasahol that we all hear/read about.