[TedEaton]

If you have the late model carb and the late model distributor, then simply hook the timed or ported vacuum port at the carb to the vacuum can on the distributor. Set the initial ignition timing with the distributor vacuum hose unhooked and hook the vacuum line back up when you're through. If all is well, there should be no change in ignition timing at idle when the vacuum hose is hooked up versus being unhooked. It's only when the engine is slightly speeded up that you should see any significant increase in ignition timing with a timing light when the vacuum part of the distributor kicks in.