The idle vacuum may be a little off (I have three cheap vac. gauges and they all differ by about 1" or so), but I'm pretty sure its under 10".
Comp Cams has dyno info on a sbc (running the xr288hr) that pulled 9.5" at 1000 rpm.
The idle mix screws are 1.5 turns out.
I'm running Doug's headers (1-7/8" primaries, 3.5" collector) 2.5" pipes w/ glasspacks. The header back exhaust is temporary until I install a 3.5" x-pipe system.
Rockers are 1.6 ratio. I had the cam spec'd out (cam doctor) and the duration @0.050" was 239/246 (a little more than comp cams specs of 236/242).