JWD,
True that both can be jetted to give the same A/F ratio, but I am going on how they do our tests here and I am guessing his engine was a 351 stroked to the 418. The 351 wouldn't have came with an 850, and they do check the number on the carb. here during the visual inspection. Maybe where he is at they don't even do a visual inspection. It does no good to jet the carb. to pass the sniffer test here if you have the wrong carb. on. And if you have the PCV unhooked they will fail you regardless of how the sniffer does. The alcohol trick has been used here with good results.
Ron
