I've been, lustfully, looking at some of these dule and triple carb manifolds for the 235 engines. Everything I've seen does not seem to be designated as usable on a 248 GMC engine. Are the 235 chevy and the 248 GMC different enough that these parts are not interchangeable? If not, does anyone know a source for a dule or triple carb manifold for the 248? :confused: