Big cam idle adjustment, Holly 4150

the cam in my 9.5:1 magnum is 242-248 @.050 .550 lift on a 110 lsa, i run my timing locked out at 36 degrees and it idles right at 1000 rpms. as everyone else has said more timing is your friend for idling on large cams. What kind of vac do you see at idle? One thing i did that helped was to eliminate the pv and do all adjusting with jets and bleeds. i only pull 10-11 inches at idle in park, cant remember what it is in gear.