Silly Timing ???????

Well it was a battle, but the 67 Notch is back together & running well. The book says to set the timing on the 273 2V @ 10 deg BTDC. My question is do I set it with the vacume advance line to the distrubutor connected or disconnected? I tried it both ways and it is now set @ 10 BTDC with the vacume line connected. On the test drive it seemed a little slugish, like it might be too retarded, much like it's driver;) :lol:
TIA-Rat :salut: