1978 olds Delta 88

Ihave a 1978 olds delta 88 holiday edition the engine is a 350 rocket eith a 4 barrell carb 270,000 miles we are having problems with it stalling when you come to a stop or at idle possible vacum loss need th know how all vacum lines hook up or if you think it could be something else. Photo of carb would be appreciated : also need to know how vacum line hooks up to spark advance thanks