round two low idel

ok So i bit and bought the new cam....It has way more vacuum then the last cam, but the problem is that I still have a 400 rpm drop...Should I still be running a locked out distrib? or should i put all the mechanical stuff back in? In park the idle is at 1000 and in gear it drops to 600-700 mostly 650...I have the initial at what I believe is 22-24 when I rev the car to 1500, because I put all the mechanical stuff back in the distrib. timing is at 40 which means 18 mechanical 22 initial...which I know is too much, but im worrying only about the initial...should I put more in? or what I have around 15psi of vac in gear, but still the rpm drop is quite big