No, no, Your problem is that crappy stock carb you are running on there, upgrade to a Weber 32/36. When I first got my truck it ran way rich and would fire on only 3 cylinders, after I replaced it it ran better but still missed, come to find out one of my spark plug wires was "Broken" somewhere, and once I replaced it, it hauled a$$, but it doesn't run now (That's a different story)
An air vale just shoots air/fuel right at the spark plug so it can burn the fuel more "efficiently"