Hello Ben A lot of times kids with ASD's do have SPD as well, and sometimes when SPD is severe it can look like an ASD as well. If his primary symptoms are social difficulties and specific intense interest than the ASD as a primary diagnosis I think would be a better fit. The gagging has to be a sensory issue though. My daughter use to gag on "mixed" textures like milk and cereal, spaghetti and sauce, casseroles ect, maybe the ravioli filling and the texture variation is gives is causing him to gag? Has he had any occupational therapy?