.........I am hooking up vacuum lines, I have a '72 Thermoquad on my '73 Roadrunner. I need a solution as to where to run the purge line from the canister, there is no provision on the earlier carb. Can I block it at the canister? Is the carb vent enough? Also, which small lines are full time vacuum, I need one for my A/C and want to put a "t" in somewhere. Thanks all.

If it's to run the A/C control (vacuum operated), use manifold vacuum.

I think you'll be fine with just the carb port from the cannister.