dpoltzer, I'm thinking it is lean-surge...a condition caused by too much timing advance (especially the vacuum advance) in the distributor. Like someone else previously mentioned, try driving it without the vacuum advance (plug the port first) and it should go away. That will tell you that there is too much advance and you either need a vacuum cannister with less (degrees stamped on the bracket portion) or get an adjustable unit. Factory cannisters are getting difficult to find, especially NOS, so that may not be a viable option.
What is you initial timing set at (vacuum advance disconnected, port plugged, idling at 600 rpm)?
Dennis
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