360 issues-need help!

the missing seems to be at mid-range rpm's, but sometimes it happens too at higher rpm, 3500 and up. i did happen to notice that the vacuum advance is not hooked up on the distributor. there does not seem to be a vacuum line loose though that should be there. if this could be the issue where should the vacuum hose run from to the vacuum advance? i am bothered by the lack of torque, which i am assuming is because of the cam, which i think is all wrong for this car. am i wrong on this?