My GVW on my 4wd 75 Blazer is 6300 with a 350 . I would think a 2wd truck would be simular.
What emisions? The only emissions on my 75 is a PVC. NO EVAP, NO Air Pump, NO Cats, No EGR and never had them. Trucks didn't get most of that till 78. Mine passed in GA no problem last time it needed Emissions. Anything older then 79 doesn't need a test here.
My 3/4 88 454 Sub is 8600lb No emissions in GA with the over 8500lb