/6 Problems
rut roh raggy. Sounds like you may have other issues with the carb. If the P.O. was willing to put it back together without gaskets, who knows what else could be missing or adjusted wrong.
Check out the carb post on .org. Very good info on the various /6 carbs with diagrams and settings.
http://www.slantsix.org/forum/viewtopic.php?t=33102
Remember that if the carb was drained of fuel it'll need a couple of good cranking sessions to fill it back up.
What did the accelerator pump cup look like? was it hard as a rock?