Okay guys. I need some help setting my timing up on my Chevelle. First let me tell you about the engine. I have a 350 bored .30 over with a Comp Cams XE268, World Products SR 68cc heads, and a Mallory unilite distributor. I just bought my first timing light and am trying to get this newly rebuilt engine running smooth.
There are 3 different curves I can choose from depending on where my vacuum advance is hooked up: the carb, the intake manifold, and plugged. Here are my curves under the 3 conditions:

Plugged:
800: 10 degrees
1000: 11 degrees
1600: 22 degrees
2000: 28 degrees
2600: 31.5 degrees
3000+: 36 degrees

Hooked up to the manifold:
800: 34 degrees
1000: 35 degrees
1600: 47 degrees
2000: 52 degrees
2600: 56.5 degrees
3000+: 60.5 degrees

Hooked up to the carb:
800: 10 degrees
1000: 11 degrees
1600: 43 degrees
2000: 50 degrees
2600: 56 degrees
3000: 58.5 degrees
3600+: 60 degrees

My question is which one do I use, and what should I adjust the distributor to? As you can see I don't have much vacuum from the carb at low RPM.

Any help would be greatly appreciated.