I think CapnCrunch is right. Vehicles need to be 25 years or older to get past the emission inspection. The intermediate sized weber carb will definitely put you out of spec. Unless you go with the smaller stock replacement?
You may have a vacuum line problem with the vacuum operated secondary.


87 Raizer, 4.3V6, Mod TH700R4,231CHD, detroit rear and LSD front, bouncy seats, 2" lift and 32x15 BFG MT tires.