Timing way off..help.

Yeah,the back is full time vacuum source. Good for power brakes. That other one is ported,does not have vacuum at idle. Off idle,cruise and so forth has vacuum. Floor it,and no vacuum. Good for vacuum advance. Awhile back I helped a guy with a small block chevy in a blazer.would not idle in gear and was a dog down low. Undrivable. He insisted no vacuum advance. Well when he left for a while I hooked it up anyways. Yeap,that's what it needed.